It is being examined by a scientist." is being "不懂啊,求高手讲解为什么这么用

It is being examined by a scientist. is being 不懂啊,求高手讲解为什么这么用 一道英语语法选择题_____ once every two years,whether it is a car,a bus or a lorry,is the rule that all drivers must obey our country.A.Having been examined B.Examined C.ExamingD.Being examined _____ once every two years, whether it is a car, a bus or a lorry, is the rule that all drivers must obey our country.A.Having been examined B.Examined C.ExamingD.Being examined选什么?为什么? ___________ once every two years,whether it is a casr,a bus or a lorry,is the rule that all drivers must obey in our country.A.Having been examined B.Examined C.Examining D Being examined选哪个,为何? 请详细讲解以下句子The fish,where it has since been sent to a museum where it is being examined by a scientist,is called oarfish. 英语翻译高中英语语法解释加翻译______ once every two years,whether it is a car,a bus or a lorry,is the rule that all drivers must obey in our country.B.Examined D.Being examined选D since The fish,which has since been sent to a museum where it is being examined by a scientist,is called an oarfish. since在这里是什么意思?the fish,which has 【since】 been sent to a museum where it is being examined by a scientist,is called an oarfish. The fish ,whih has since been sent to a museum where it is being examined by a scientist ,is called an oarfish.中的since是什么意思? The fish,which has since been sent to a museum where it is being examined by a scientist,is called an oarfish. ___twice a year,whether it is a car or a bus or a truck,is the rule that every driver must obey in this city.A.Examining B.Examined C.Being examined D.Having been examined 类似这道题中的bc选项 be+v–ed和v–ed的用法有什么区别 The patient ____ by the doctor is Li Ming's mother.A.to examine B.examining C.is examined D.being examined 求教非谓语英语选择题.____________twice a year ,whether it is a car or a bus or a truck,is the rule that every driver must obey in this cityA ExaminingB Examinedc Being examinedD Having been examined为什么选C, The clock stopped working again.It really need( )A.to being thoroughly examined B.to be overhauledC.being completely repaired D.being thoroughly mending The cause of the fire is being___ ____.句型转换：The cause of the fire is being examined. __ twice a year ,whether it is a car or a bus or a truck,is the rule that every driver must obeyA.Examining B.Examined C.Bing examined D.Having been examined为何选C __ twice a year ,whether it is a car or a bus or a truck,is the rule that every driver must obey in this city.A.Examining B.Examined C.Bing examined D.Having been examined That every vehicle,whether it is a car,a bus or a truck,must _____ twice a year driver must obey in this city.A.examing B.examined C.having been examined D.be examined为什么选D呢,