单项选择题

Not until this week were they aware of the problems with the air-conditioning units in the hotel rooms.

A．这个星期旅馆里的空调间出问题了，他们没有意识到。
B．直到这个星期他们才意识到该修理旅馆房间里的空调了。
C．直到这个星期他们才知道旅馆房间里的空调设备有问题。
D．他们查不出旅馆房间内空调的故障，这个星期会请人来检查。
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