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By the middle of the twenty-first century, the robot a necessity in every home.

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By the middle of the twenty-first century, the robot a necessity in every home.

By the middle of the twenty-first century, the robot ________ a necessity in every home.

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A．becomesB．had becomeC．has becomeD．will have become

试题答案

答案：D

标签：centuryfirstnecessityrobottwenty

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