单项选择题

A．room
B．cabin
C．cell
D．floor
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单项选择题
A．inB．forC．atD．by
A．in
B．for
C．at
D．by
单项选择题
A．watchedB．has been watchingC．had been watchingD．had watched
A．watched
B．has been watching
C．had been watching
D．had watched
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