单项选择题

______ are nine.

A. Three threes
B. Three and three
C. Three three
D. Three and threes
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单项选择题
Don' t smoke until the plane ()off.

A. takes
B. took
C. has taken
D. had taken
单项选择题
A thief is a danger to()

A. society
B. a society
C. the society
D. societies
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