单项选择题

Mr. Smith has two daughters, ______ are famous singers.

A．both they
B．both of them
C．they both
D．both of whom
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单项选择题
______ right at the traffic lights, you will see a red building.
A．Turn
B．To turn
C．Turning
D．If turned
单项选择题
He is wet to the skin. It ______ heavily.
A．must be raining
B．must rain
C．may be raining
D．must have rained
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