单项选择题

Steam ______ into water when it touches a cold surface.

A. shrinks
B. contracts
C. condenses
D. compresses
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单项选择题
One of my （）customers was Fred Hasbrook, an electronics salesman.

A. regular
B. normal
C. formal
D. conventional
单项选择题
（）, Tom would have been a wealthy man.

A. Was he to enter business
B. If he was to enter business
C. Was he entered business
D. Had he entered business
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