-Leo,what do you think is the most helpful in modern times?-I think it is the computer.A. invent B. inventor C. invention D. invented 题目和参考答案——青夏教育精英家教网—

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( )19. —Leo,what do you think is the most helpful_in modern times?

—I think it is the computer.

A. invent B. inventor C. invention D. invented

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