题目内容

Scientists are trying to develop a special material, _______ they will make use of in space.
A．thatB．whatC．itD．one
D

试题分析：句意，科学家们正在尝试发明一种特殊的物质，一个可以在太空中使用的物质。one 指代 a special material, 其他的that和it 是特指的，不能代替 a special material, what不能引导定语从句，所以这道题只能选one。
点评：要了解各个代词的基本用法，平时在理解的基础上记忆。为了避免重复one用来代替上文提到过的某一个可数名词!
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