两题改错...help!【英语吧】

英语吧关注：1,576,712贴子：11,456,946

1.Studies have been carried on the subject for many years.
2.Such things have never been heard before.

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1楼2007-06-23 06:01回复

为什么没人理啊?很难么?

3楼2007-06-23 07:37

不感兴趣

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1.Studies have carried on ON this subject for many years.
2.Such things have never been heard OF before.

4楼2007-06-23 07:55

1.Studies had carried on this subject for many years.
2.Such things have never been heard of .

5楼2007-06-23 09:46

Such things have never been heard

6楼2007-06-23 09:47

I agree with the up stair!

7楼2007-06-23 09:57

第一题为什么要用主动的?

8楼2007-06-23 19:32

我认为六楼根本不了解hear的用法，哪些词可以作它的宾语，哪些必须通过介词来连接，所以以为“简洁”就正确�

9楼2007-06-23 19:36

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