单项选择题

After ______ seemed an endless wait, it was her turn to step into the doctor's office.

A．it
B．that
C．what
D．which
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单项选择题
The mayor didn’t have time so far to go into it ______ , but he gave as an idea about his plan.
A．in conclusion
B．at hand
C．at length
D．in turn
单项选择题
His name was on the ______ of my tongue, but I just couldn’t remember.
A．edge
B．rim
C．border
D．tip
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