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We must people on the floor until it is firm. [ ] A.stop; to walk B.stop; from w

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We must people on the floor until it is firm. [ ] A.stop; to walk B.stop; from w

We must ________people ________on the floor until it is firm.

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A.stop; to walk B.stop; from walkingC.keep; walking D.prevent: to walk

试题答案

答案:B