Some scientists think robots will talk like humans in the future．( )A．canB．mayC．be able to 题目和参考答案——青夏教育精英家教网—

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6．Some scientists think robots will _______talk like humans in the future．（　　）

A．

can

B．

may

C．

be able to

分析句意：一些科学家认为机器人在将来将能够与人类谈话．

解答答案：C 根据题目will（将），这是一个情态动词，可以与固定短语be able to（能）连用，表示有能力做某事；但不能与can（能），may（可以）这两个情态动词连用．be able to有较多的时态形式，而且还可与其它情态助动词连用．表达将来的"能力"时，一般用be able to；故答案为C．

点评语法上，严格地说，can属于情态助动词（modal auxiliary verb），它只有现在和过去两种时态形式，而be able to属于半助动词（semi-auxiliary verb），它却有较多的时态形式，而且还可与其它情态助动词连用．表达将来的"能力"时，一般用be able to；表达完成概念时，则只能用be able to．

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