单项选择题

Aren't they ______

A．yours friends
B．friends of yours
C．friends of you
D．friends of your
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单项选择题
More than one question ______ asked.
A．was
B．be
C．were
D．been
单项选择题
The tree was cut ______.
A．down
B．in
C．off
D．out
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