People________breathewhentheyareunderwater.A.can'tB.mustn'tC.shouldn

发布时间:2020-08-06 20:45:37

People ________ breathe when they are under water.A.can'tB.mustn'tC.shouldn'tD.needn't

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A解析考查情态动词。句意为:当人在水底的时候他们就不能呼吸了。Can't表示不能;mustn't表示不可以;needn't表示不必;shouldn't表示不应该,根据意思来判断应该选A。
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