the harry potter books have ( have become ）pretty popular since they were published为什么这样做
题目
the harry potter books have ( have become ）pretty popular since they were published为什么这样做
答案
看到since引导的时间状语从句时首先想到用现在完成时,而become的完成时形式是become
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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