单项选择题

Mary was behaving ______ she hadn’t grown up.

A. as
B. while
C. if
D. as though
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单项选择题
______ my bank lent me the money, I would have bought a new house.
A. Had
B. If
C. Be
D. Would
单项选择题
______ you had been here, we wouldn’t have had so much trouble then.
A. When
B. If
C. As
D. Since
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