________, it began to rain unexpectedly.A．While cleaning the machineB．To clean t_刷题宝

题干

________, it began to rain unexpectedly.

A．While cleaning the machine

B．To clean the machine

C．He was cleaning the machine

D．While he was cleaning the machine

上一题下一题 0.64难度单项选择更新时间:2012-12-24 06:52:54

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