单项选择题

Don't speak unless you

A．ask to
B．are asked to
C．asked
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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
Old people ______ carefully.
A．must be listened
B．must be listened to
C．must listen to
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