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 |
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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 |
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