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【题目】 Experiments _______ that children can be instructed in swimming at a very early age, as early as about two months.

A.are provingB.will be provedC.are provedD.have proved

【答案】D

【解析】

考查现在完成时态。句意:实验证明,儿童在很小的时候就可以开始学习游泳,最早两个月大就可以了。此处表示到现在为止已经得到的证明,所以句子用现在完成时态,且主语是Experiments,名词复数,故选D

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