We observed some young men __________into the building at 11：00 last night.A．to_刷题宝

题干

We observed some young men __________into the building at 11：00 last night.

A．to slip	B．slipped
C．slipping	D．being slipped

上一题下一题 0.64难度单项选择更新时间:2015-03-10 06:13:45

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