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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You must explain to us how they succeeded _____ the experiment.
A) for
B) at
C) in
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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
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