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
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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
单项选择题
I wish I ______ longer this morning, but I had to get up and come to class.
A. could have slept
B. slept
C. might have slept
D. have slept
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