the harry potter books have ( have become )pretty popular since they were published为什么这样做

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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