单项选择题

A．millions
B．million
C．million of
D．millions of
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单项选择题
A．on the averageB．on the other handC．on conditionD．while
A．on the average
B．on the other hand
C．on condition
D．while
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
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