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You can come here to ask me ________ if ...

You can come here to ask me ________ if you have any questions.

A. at one time                               B. at a time                    C. at any time                 D. all the time

 

C 【解析】 考查短语辨析,at one time 一度,曾经,at a time 一次,每次,at any time 在任何时候,all the time 一直,句意:如果你有问题的话任何时候你可以过来问我。故选C。  
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