单项选择题

Was it because it snowed last night _____ you didn't come

A) when
B) that
C) so
D) what
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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
单项选择题
You must explain to us how they succeeded _____ the experiment.
A) for
B) at
C) in
D) to
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