Q:

________ the earth cooled down, water began to appear on its surface.

A.With

B.Because

C.As

D.While

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正确答案:C

“随着地球冷却下来,水开始出现在它的表面.”while“当……时候”,后接延续性动词;with后不接句子;as“当……时”,说明两种正在发展变化的情况.

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