单项选择题
A．from
B．in
C．toward
D．by
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单项选择题
A．byB．beforeC．afterD．since
A．by
B．before
C．after
D．since
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单项选择题
A．At the same timeB．On the contraryC．For exampleD．In a word
A．At the same time
B．On the contrary
C．For example
D．In a word
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