单项选择题

Rod did nothing but ______ trick on me.

A．playing
B．to play
C．to playing
D．play
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单项选择题
My boss won' t pay me ______ I work harder.
A．if
B．in case
C．unless
D．lest
单项选择题
He' s ______ because he has won the prize.
A．excite
B．excited
C．exciting
D．to be exciting
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