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问题: 求救,一道英语题

______worries his mother a lot _____Tom is getting more and more quiet at home.
A.That ;which B.It;that C.Whether;what D.what;that

解答:

B对.这是主语从句后置.变化: That Tom is getting more and more quiet at home worries his mother a lot=== It worries his mother a lot that Tom is getting more and more quiet at home.