单项选择题

The silence of the library _____ only by the sound of pages being turned over.

A．has been broken
B．was broken
C．broke
D．breaks
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单项选择题
Mr. Hall understands that _____ math has been easy for him, it is not easy for the students.
A．although
B．because
C．if
D．when
单项选择题
Their happy voices showed that they were having a _____ talk.
A．noisy
B．serious
C．complete
D．friendly
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