When he knocked at the door, my mother was busy ____ supper.A．preparing forB．in
题型：不详难度：来源：
When he knocked at the door, my mother was busy ____ supper.| A．preparing for | B．in preparing | | C．to prepare for | D．to prepare |
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答案
| B |
解析
| “be busy (in)doing something”忙于干谋士，要求接动词的-ing形式。准备的直接宾语是“supper”,故其前面不用介词for。 |
举一反三
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