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【题目】If you have any problems, you can ask Dr. Know-all _________ help.
A.at
B.on
C.for
D.with

【答案】C
【解析】句意:如果你有问题,你可以向Dr. Know-all寻求帮助。根据句意“向……寻求帮助”是ask sb. for help,所以答案是C。

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