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—Where is our English teacher?

    —She is in the classroom, _____ the exercises _________ the students have done at home.

   A. explaining; /                                           B. explaining; for

   C. explained; to                                          D. explained; from

A


解析:

explain的逻辑主语是she,用explaining表伴随状语,the students have done at home为定语从句,省略了关系代词that/which。故选A。

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