单项选择题

It was two years ago（）she went to teach in the mountains, and we have never seen her since then.

A．when
B．before
C．that
D．after

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单项选择题
My cousin demanded that she（）accompany me to the doctor.

A．should
B．would
C．could
D．might
单项选择题
Once you enter the society, you are mostly（）your own.

A．in
B．on
C．of
D．to
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