【題目】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】

試題分析：考查關系詞。句意：全球變暖的事實是很多科學家后很擔憂。同位語從句，That引導的從句是the fact的同位語，故選D項。

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