【題目】 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】

試題分析：句意：如果你有問題，你可以向Dr. Know-all尋求幫助。根據(jù)句意及題干分析“向……求助”是ask sb. For help，故選C。

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