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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单项选择题
Doctors often make higher ______ for their works than they should.
A. charges
B. bills
C. costs
D. payments
单项选择题
Though it was late in the night, ______ he continued to work vigorously.
A. but
B. yet
C. and
D. that
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