单项选择题

To______ the students' life on campus, the university has established many recreational facilities.

A．verify
B．convey
C．enrich
D．enhance
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单项选择题
The supervisor didn't have time so far to go into it______ , but he gave us an idea about his plan.
A．at hand
B．in turn
C．in conclusion
D．at length
单项选择题
We should always make full investigations______ to reaching a conclusion.
A．bound
B．previous
C．superb
D．obstinate
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