Question

【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

Answer 1

【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。