In order not to be disturbed, he spent two hours ____ in his study.A．lockingB．to_刷题宝

题干

In order not to be disturbed, he spent two hours ____ in his study.

A．locking

B．to lock

C．locked

D．being locked

上一题下一题 0.4难度单项选择更新时间:2014-03-17 08:33:39

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