单项选择题


A．by
B．after
C．of
D．for
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单项选择题
A．thereforeB．consequentlyC．howeverD．moreover
A．therefore
B．consequently
C．however
D．moreover
单项选择题
A．againB．thusC．repeatedlyD．yet
A．again
B．thus
C．repeatedly
D．yet
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