He said he had learnt about three thousand English words by the

He said he had learnt about three thousand English words by the end of middle school.

A.他说到学期中时，他大约学了3000个英语单词。

B.他说到期末时，他大约学了3000个英语单词。

C.他说到中学毕业时，他大约学了3000个英语单词。

正确答案是C

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