单项选择题


A．after
B．for
C．at
D．like
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单项选择题
A．The environmental problem.B．The health problem.C．The educational problem.D．The international problem.
A．The environmental problem.
B．The health problem.
C．The educational problem.
D．The international problem.
单项选择题
A．by busB．by coachC．by taxiD．by car
A．by bus
B．by coach
C．by taxi
D．by car
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