单项选择题

Hot metal ______ as it grows cooler.

A. reduces
B. contracts
C. compresses
D. condenses
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单项选择题
The Johnsons must have been out, （）there is no light which can be seen in their house tonight.

A. for
B. because
C. since
D. as
单项选择题
If you （）that late movie last night, you wouldn't be dozy now.

A. haven't watched
B. didn't watch
C. hadn't watched
D. wouldn't have watched
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