单项选择题

My boss won't pay me（）I work harder.

A．if
B．in case
C．unless
D．lest

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

A．should
B．would
C．could
D．might
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