题目内容

I didn't answer the phone__I didn't hear it ring.

A. if
B. unless
C. although
D. Because.

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Busy_he was, he tried his best to help us. "

A. as
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After the war, a new school building was put up__there had once been a theatre.

A. as
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C. if
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A. whether
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A. as
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C. where
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