although the cause of cancer ___ ,we do not yet have any practical way to prevent it.a,are beinguncovered b,have been uncovering c,are uncovering d,have uncovered选a,为什么?

语法有错没?Although ,it's turnning blue,it's nothing new.but,i still thank you for having loved me.cause u're the apple…… go fuck it up and telling ur mom u need the newne cause that o cause of the in the cause the cause of public the cause was lost the cause of the slaves 1011621: although we believe that such technological advance is a great aid to our every working life, the use of E-mail can be the cause of many lost hours in the working day.想知道的语言点：1—the use of E-mail can be the cause of many los 1011621:although we believe that such technological advance is a great aid to our every working life,the use of E-mail can be the cause of many lost hoursin the working day.想知道的语言点：1—the use of E-mail can be the cause of many lost h the root cause for 与the root cause in 区别 cause the feeling是什么意思原句是things that cause the feeling the cause of American Revolution? the direct cause of sth. 一个英语改错的疑问a president said 'it is we who are to blame'.although his few words sound simple.they clearly point out the cause.答案中把few改成little这里不是修饰可数名词吗为什么 although the cause of cancer ___ ,we do not yet have any practical way to prevent it.a,are beinguncovered b,have been uncovering c,are uncovering d,have uncovered选a,为什么? 英语翻译Infection by Enterobacter sakazakii has emerged as a rare cause of neonatal meningitis,septicemia,and Enterocolitis.Contaminated infant formula has been the principle infection or transmission vehicle,although E.sakazakii has been isolate the cause of gay rights中的cause是什么理解 cause