He has been ill with a strange disease lately, ______I’d never heard of before.

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问题 He has been ill with a strange disease lately, ______I’d never heard of before.

选项 A、it
B、this
C、that
D、one

答案D

解析 他最近得了一种很奇怪的病,这种病我从来没听说过。it,that和one都可以代替上文已提及的事或人,以避免重复,但它们的用法是有区别的。it替代上文中出现的同一人或事物,that,one指代同类事物或人中的一个或一件。本题中的one是a strange disease的同位语,之后跟一个由that引起的定语从句,that又可以省去。
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