题目内容

【题目】Look! ___________ people ___________?

A. Does, litter B. Are, littering C. Did, litter D. Were littering

【答案】B

【解析】句意：Look!说明动作正在进行，“看！人们正在乱扔垃圾吗？”用现在进行时。现在进行时的句子结构为：主语+am/is/are+doing. 故答案为B.

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