________，hetookaninterestinbiol

发布时间：2020-07-28 04:48:51

________，he took an interest in biology.A.When very youngB.When he youngC.As very youngD.When being young

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A解析when+adj. / n. / doing / done结构，省略了主谓，或后接完整的句子，when he was young．
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