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

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

 

C

句意: 近年來全球氣候不斷變暖, 這一事實使得很多科學(xué)家感到擔(dān)憂。本題考查同位語從句。該題同位語從句結(jié)構(gòu)完整, 故選連詞that。

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