单项选择题

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

A．locking
B．locked
C．to lock
D．being locked
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单项选择题
He hurried out of the classroom______ the class was over.
A．a moment ago
B．the moment
C．at the moment
D．the moment that
单项选择题
The______ has become extremely tense. A war could break out any time between the two sides.
A．pollution
B．friendship
C．situation
D．condition
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