问题
阅读理解
By the time he was twenty, he receiveda doctor’s degree.
A B C D
答案
C received---had received
根据前面的时间状语，判断这里要用过去完成时。
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By the time he was twenty, he receiveda doctor’s degree.
A B C D
C received---had received
根据前面的时间状语，判断这里要用过去完成时。