The fact has worried the people across the world ___________ the earth is becoming warmer and warmer these years.
A．whatB．whichC．thatD．where
：C
：考查同位語從句。同位語從句that the earth is becoming warmer and warmer these years對前面的the fact的內容進行解釋說明。That起引導作用，不充當任何成分，沒有任何意義。故C正確。
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