单项选择题

If you travel in a foreign country, a tour _______may save you a lot of trouble.

A．director
B．helper
C．guide
D．assistant
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单项选择题
—How about having dinner at Sun Restaurant—It _______good.
A．smells
B．looks
C．sounds
D．appears
单项选择题
The old man has two daughters, _______are doctors.
A．both of them
B．both of whom
C．both who
D．they both
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