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The chemistry teacher was standing by the desk, explaining the exercises the stu

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The chemistry teacher was standing by the desk, explaining the exercises the stu

The chemistry teacher was standing by the desk, explaining the exercises ________ the students had done at home.

[]

A./

B.to

C.for

D.with

试题答案

答案:A

解析:

空白后是一个定语从句,省略了关系代词which.