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
The girl has to ______ her further study because of her mother's illness.
A．abandon
B．relieve
C．desert
D．quit
单项选择题
The newly-built sound lab will be ______ next term so that the students will be easily understood the mechanism of echo.
A．put in use
B．in use
C．put into use
D．for use
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