单项选择题

A．therefore
B．since
C．furthermore
D．forever
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单项选择题
A．itsB．hisC．theirD．our
A．its
B．his
C．their
D．our
单项选择题
A．thereforeB．howeverC．thoughD．thereby
A．therefore
B．however
C．though
D．thereby
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