学科：高中英语
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发布时间：2010-08-10
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21.This is a simple idea, but___________ which is hard to put ________ into practice.

A .one; x B. the one; it C. that; it D. one ; it

22. The project along with the experiment we had once devoted so much time _________ perfectly.

A .to work out B. to working out C. to worked out D. has worked out

23. Most US citizens retire around the age of 62, __________ is the national minimum retirement age.

A . when B which C. it D. that

24. I forget where I read the article, or I ________ it to you now.

A . will show B. would show C. am going to show D. am showing