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    Is necessary them to stop every two hours? A. that; for; resting B. that; of; to rest C. it; for; to rest D. it; of; resting 【查看更多】

     

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     Is_____ necessary ____them to stop ________ every two hours?

    A. that; for; resting   B. that; of; to rest   C. it; for; to rest   D. it; of; resting

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