It was____the old worker came that we____the experiment. A．until;didn’t beginB．n

题干

It was____the old worker came that we____the experiment.

A．until;didn’t begin	B．not until;began
C．until;began	D．not until;didn’tbegin

上一题下一题 0.64难度单项选择更新时间:2013-08-02 10:17:59

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