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
The tree was cut ______.
A．down
B．in
C．off
D．out
单项选择题
The day finally came ______ I was given a job.
A．which
B．when
C．since
D．because
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