David is a clever boy,and he learned seven languag

发布时间：2021-02-20 22:49:16

David is a clever boy,and he learned seven languages since 1981.那里错了,请说明那里和改正.

网友回答

he has learned seven languages since 1981.and连接的前后两个句子一般情况下是保持时态一致的,而且since常用于完成时,所以用has learned而不是learned
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