In order not to be disturbed, I spent three hours _______ in my study. A．locking_刷题宝

题干

In order not to be disturbed, I spent three hours _______ in my study.

A．locking

B．locked

C．to lock

D．to be locked

上一题下一题 0.64难度单项选择更新时间:2013-11-12 03:00:49

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