We were about to go out for a walk ________ it began to rain.A．whileB．beforeC．as_刷题宝

题干

We were about to go out for a walk ________ it began to rain.

A．while

B．before

C．as

D．when

上一题下一题 0.64难度单项选择更新时间:2013-03-12 09:13:44

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