单项选择题

Encouraged by the government, they are willing to ______ the most challenging project.

A．undergo
B．underline
C．understand
D．undertake
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单项选择题
His difficulties in his work ______ from his lack of experience.
A．issue
B．campaign
C．cause
D．question
单项选择题
Since the stranger came, strange ______ had happened successively in the village.
A．accidents
B．events
C．incidents
D．acts
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