单项选择题

Old people ______ carefully.

A． must be listened
B． must be listened to
C． must listen to
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单项选择题
—I want to buy a shirt.—______ do you wear
A． What size
B． How much size
C． Which size
单项选择题
Don't speak unless you
A． ask to
B． are asked to
C． asked
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