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
Had he come earlier, he ______ my brother.
A．would meet
B．shall meet
C．shall have met
D．would have meet
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单项选择题
The conference was organized for all the ______ in the city
A．mathematics teacher
B．mathematic teachers
C．mathematics teachers
D．mathematic's teachers
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