单项选择题

A．at a time
B．sometime
C．sometime
D．sometimes
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单项选择题
A．severalB．a great deal ofC．fewD．thousands of
A．several
B．a great deal of
C．few
D．thousands of
单项选择题
A．naturallyB．carefullyC．chemicallyD．physically
A．naturally
B．carefully
C．chemically
D．physically
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