单项选择题

A thirty-minute-call anywhere in the United States costs ______ than a dollar when you dial it yourself.

A．least
B．less
C．few
D．little
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单项选择题
English serves as a common tongue in countries ______ people speak many different languages.
A．which
B．why
C．where
D．that
单项选择题
My sister's professor had her ______ her paper many times before presenting it to the committee.
A．rewrite
B．to rewrite
C．rewrote
D．rewriting
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