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【题目】People throughout the world together now to protect the natural environment.

A. are working B. worked

C. will work D. have worked

【答案】A

【解析】句意:全世界的人们现在都在一起努力保护自然环境。work together是固定搭配,意思是“合作、共同工作”,本题考查时态,根据now可知本题选择现在进行时。故答案选A

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