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【题目】The fact has worried many scientists_______ the earth is becoming warmer and warmer these days.

A. what B. which C. when D. That

【答案】D

【解析】

试题分析:考查关系词。句意:全球变暖的事实是很多科学家后很担忧。同位语从句,That引导的从句是the fact的同位语,故选D项。

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