单项选择题


A．group
B．mixture
C．diversity
D．variety
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单项选择题
A．whenB．untilC．unlessD．before
A．when
B．until
C．unless
D．before
单项选择题
How many of the passengers have been injured in the train accident
A．30.
B．90.
C．120.
D．6.
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