问题补充:
By the time he was twenty, he receiveda doctor’s degree.
A B C DC received---had received
答案:
(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。
时间:2019-05-20 16:29:49
By the time he was twenty, he receiveda doctor’s degree.
A B C DC received---had received
(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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