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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Was it because it snowed last night _____ you didn't come
A) when
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C) so
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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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