单项选择题

A．will not be
B．has not been
C．was
D．is
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单项选择题
A．as a resultB．for exampleC．howeverD．furthermore
A．as a result
B．for example
C．however
D．furthermore
单项选择题
A．difficultB．easyC．clearD．hard
A．difficult
B．easy
C．clear
D．hard
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