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问题: 选择

18. Why is ___ you are so late for the class?
A. it that B. that it C. it D. that
20. _____ we are doing has never been done before.
A. That B. What C. Which D. Whether
给出解释

解答:

1 A 你怎么这么迟才来上课。that加后边的you are...使后边的句子变成合适的表语形式,it是由于后边表语是个句子故用it代一下


2 B 我们正在做着别人从来没做过的事。 我们做的事,这个事应该用what来代替,其他的不行