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
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单项选择题
Do what you think is right, ________ they say.
A．however
B．whatever
C．whichever
D．if only
单项选择题
He is very ________ in using money.
A．economic
B．economical
C．econemy
D．economize
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