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

A. what          B. which         C. that       D. though

C  

解析：本題考查間隔式同位語(yǔ)從句的用法。即先行詞是the fact 和that引導(dǎo)的同位語(yǔ)從句中間隔了謂語(yǔ)部分。

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