单选Most environmental problems exist because adequate for preventing them __ takeen in the past.A.was not B.were not being C.were not D.being not答案怎么不是B?

单选Most environmental problems exist because adequate for preventing them __ takeen in the past.A.was not B.were not being C.were not D.being not答案怎么不是B? 单选,1.it has been called the most important（ ）photography ever taken.a.environment b.the environment c.environmental d.the environmental 2.the boy （ ）is dressed in garden looks very sad.a.that b.which c.who d.how 第二个我们老师讲 environmental environmental environmental Most environmental problems?Most environmental problems exist because adequate for preventing them…taken in the past.…were not,were not being,had not been.选什么?其它怎么不对? Most environmental problems exist because adequate measures for preventing them_____taken in the paA、was notB、were not beingC、were notD、being not选哪个 详细 分析下各个选项.这个题对我很重要 .感谢帮助.还有 been 和b environmental aerosol environmental是什么意思 英语翻译An environmental service is a sector where most trade take place through commercial presence with the accompanying presence of natural persons. Most environmental problems exist because adequate measures for preventing them_____taken in the paA、was notB、were not beingC、were notD、being not 独立主格Among the most dangerous environmental threats that we face ARE compu-garbage,Are哪里错了?为什么改,改成什么? 英语口语考试,求speechTopic 1:Environment IssuesDirections:You are talking about environmental problems that worry you most as well as how to act green in daily life. We can have more ____ buildings and houses .A.environmental friend B.environmental friendlyC.environmentally friend D.environmentally friendly为什么选D不选A,请详解, an environmental problem in China.可以是文章也可以是新闻报道,主题如题目所示,要纯英文的,单词数200词左右. environmental problem and Technology可以是文章也可以是新闻报道,主题如题目,要纯英文的,单词数200词左右. 一道高中英语单选The garden is __this month,looking __beautiful.A.at best,most B.at its best,most C.for the best,the most D.at the best,the mos为什么best前要加its,为什么most前不加the呢 单选 1:Do you enjoy your trip?2:Yes.I never take part in such __ beforeA.the most excited B.the most exciting C.a more exciting