单项选择题

Mr. Grey has two sons, _________ are famous dancers.

A．both they
B．both of them
C．they both
D．both of whom
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单项选择题
It was dark. We decided to _________ for the night at a beerhouse.
A．put away
B．put down
C．put up
D．put on
单项选择题
I see Mary _________ day in school. I know her very well.
A．every the second
B．every second
C．the every second
D．the second
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