【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(guān)系詞。句意：全球變暖的事實(shí)是很多科學(xué)家后很擔(dān)憂。同位語(yǔ)從句，That引導(dǎo)的從句是the fact的同位語(yǔ)，故選D項(xiàng)。

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