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We had planted three thousand trees the end of March. [ ] A.by B.in C.at D.to

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We had planted three thousand trees the end of March. [ ] A.by B.in C.at D.to

We had planted three thousand trees ________ the end of March.

[]

A.by

B.in

C.at

D.to

试题答案

答案:A

解析:

根据题意“到三月底,我们已经栽了3000棵树”。根据题干中的过去完成时,应判断用短语by the end of。