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【题目】Many scientists believe that robots ______ able to talk like humans in 50 years.

A.were B.are

C.will be D.have been

【答案】C

【解析】

试题分析:句意:许多科学家认为,五十年过后,机器人将能够像人类一样说话。描述五十年后将要发生的动作或状态,用一般将来时态。故选C

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