Dr．Zhouissaid________abroadwhenhe

发布时间：2020-07-27 03:30:38

Dr．Zhou is said ________ abroad when he was in his twenties．A.to have studiedB.to studyC.to be studyingD.to have been studying

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A解析to have studied表示动作发生在主句的谓语之前。
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