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【题目】Professor Smith’s theories explain how the universe works, ?

A.does heB.is heC.don’t theyD.aren’t they

【答案】C

【解析】

句意:史密斯教授的理论解释了宇宙是如何运行的,不是吗?

本题考查反意疑问句。此处主语Professor Smith’s theories是复数形式,用代词they代指。谓语explain是实义动词,因此变为反意疑问句时,用助动词don’t,故选C

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