Is_____ necessary ____them to stop ________ every two hours?
A．that; for; restingB．that; of; to restC．it; for; to restD．it; of; resting
C
it is necessary for sb to do sth “對(duì)于某人來(lái)說(shuō)有必要做某事”，stop to do 停下來(lái)做另一件事，stop doing停止做某事，答案C。
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