单项选择题

A．on the average
B．on the other hand
C．on condition
D．while
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单项选择题
A．at leastB．at mostC．for certainD．with ease
A．at least
B．at most
C．for certain
D．with ease
单项选择题
A．correspondsB．accounts forC．derives fromD．conforms to
A．corresponds
B．accounts for
C．derives from
D．conforms to
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