问题
选择题
Anyway, Jack knows _______ help about travelling .
A．who to ask
B．who to ask to
C．who to ask for
D．to ask for who
答案
答案：C
题目分析：句意：不管怎样，杰克知道向谁求助旅行知识。ask for help求救，疑问词加不定式做宾语，故选C.
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