How long do you believe it will be _____ Chinese people land on the moon?A．befor_刷题宝

题干

How long do you believe it will be _____ Chinese people land on the moon?

A．before

B．since

C．when

D．that

上一题下一题 0.64难度单项选择更新时间:2010-11-02 01:53:13

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