When he knocked at the door, my mother was busy ____ supper.
A．preparing forB．in preparing
C．to prepare forD．to prepare
B
“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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