单项选择题

He has some electronic equipment originally intended for the language laboratory, which ______ the sound quality.

A．magnifies
B．strengthens
C．enhances
D．enlarges
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单项选择题
This diploma ______ that you have completed high school.
A．certifies
B．clarifies
C．rectifies
D．exemplifies
单项选择题
The course is very popular and the quotas are limited, so it's best to ______ as soon as possible.
A．enroll
B．subscribe
C．absorb
D．register
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