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
He' s ______ because he has won the prize.
A．excite
B．excited
C．exciting
D．to be exciting
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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