单项选择题

A．know
B．knew
C．have known
D．had known
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单项选择题
Before graduation, the students in the university should ______.
A．take part in at least one community activity
B．volunteer for the all community activities
C．join one of the communities
D．do service as much as possible
单项选择题
A．mend me the watchB．mend me my watchC．have my watch mendedD．have mended my watch
A．mend me the watch
B．mend me my watch
C．have my watch mended
D．have mended my watch
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