The boy was saved because the doctor arrived there _____ it was too late.A．befor_刷题宝

题干

The boy was saved because the doctor arrived there _____ it was too late.

A．before

B．since

C．or

D．while

上一题下一题 0.4难度单项选择更新时间:2012-09-24 08:21:56

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