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精英家教網 > 高中英語 > 題目詳情

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,要求接動詞的-ing形式。準備的直接賓語是“supper”,故其前面不用介詞for。

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