题目内容
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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