By the time he was twenty, he receiveda doctor’s degree. A B C DC received---had received

发布时间:2020-08-17 13:32:34

By the time he was twenty, he receiveda doctor’s degree.
A            B        C          DC received---had received 

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(答案→)C received---had received 
解析:根据前面的时间状语,判断这里要用过去完成时。
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