单项选择题

This diploma ______ that you have completed high school.

A．certifies
B．clarifies
C．rectifies
D．exemplifies
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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
单项选择题
The results of the experiments were ______ and they will have to be done again.
A．comprehensive
B．alternative
C．deliberate
D．ambiguous
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