赞题库-背景图
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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热门试题

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