单项选择题

In my opinion, you can widen the ________ of these improvements through your active participation.

A．dimension
B．volume
C．magnitude
D．scope
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单项选择题
I don' t think he is serious, ______
A．do I
B．is he
C．don' t I
D．isn' t he
单项选择题
Do what you think is right, ______ they say.
A．however
B．whatever
C．whichever
D．if only
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