A professor reported that he____________(已发现一种新方法帮助老人) improve their memories.A

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问题 A professor reported that he____________(已发现一种新方法帮助老人) improve their memories.

选项

答案 A professor reported that he had discovered a method to help the old improve their memories．

解析因discovered发生在reported之前，所以在report引导的宾语从句中谓语动词需用过去完成时态，即had discovered表达。

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[originaltext]In1880,ProfessorJigoroKanoofJapanbegananewsport.He