—Shall we go out for a walk?—I'm afraid not．We can't go out ___ our work is bein

题干

—Shall we go out for a walk?
—I'm afraid not．We can't go out ___ our work is being done．

A．before

B．until

C．as

D．after

上一题下一题 0.64难度单项选择更新时间:2014-06-27 05:34:02

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