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
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
单项选择题
The locals, all of whose homes ______by the flood, received help from the Red Cross.
A. damaged
B. had been damaged
C. damaging
D. to damage
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