When he knocked at the door, my mother was busy ____ supper.

A. preparing for                                   B. in preparing

C. to prepare for                                 D. to prepare

B


解析:

“be busy (in)doing something” 忙于干謀士，要求接動(dòng)詞的-ing形式。準(zhǔn)備的直接賓語是“supper”,故其前面不用介詞for。

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