I won’t tell the student the answer to the math problem until he______ on it for

题干

I won’t tell the student the answer to the math problem until he______ on it for more than an hour.

A．has been working	B．will have worked
C．will have been working	D．had worked

上一题下一题 0.64难度单项选择更新时间:2013-12-10 08:36:28

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