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The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

A.what

B.which

C.that

D.though

 

【答案】

C

【解析】考查同位语从句。同位语从句That the earth is becoming warmer and warmer these years解释名词the fact的内容,that起引导作用,不充当任何成分。

 

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