单项选择题

He is a brilliant professor but has his ______ as an administrator.

A．boundaries
B．restraints
C．confinements
D．limitations
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单项选择题
His name was on the ______ of my tongue, but I just couldn't remember it.
A．point
B．edge
C．tip
D．top
单项选择题
There is no electricity again. A ______ has blown, causing the lights to fail.
A．fuse
B．wire
C．plug
D．circuit
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