Mary was very busy last week. She did the work all ______ herself. [ ]A. inB. on C. at D. by-初中英语-n多题

◎ 题干

Mary was very busy last week. She did the work all ______ herself.

[ ]

A. in　　　　　　　
B. on 　　　　　
C. at 　　　　　　
D. by

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◎ 解析

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