单项选择题

His difficulties in his work ______ from his lack of experience.

A．issue
B．campaign
C．cause
D．question
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单项选择题
Since the stranger came, strange ______ had happened successively in the village.
A．accidents
B．events
C．incidents
D．acts
单项选择题
After four years' hard study in Harvard, he has got a ______ knowledge of medicine.
A．potential
B．comprehensive
C．respective
D．exclusive
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