the harry potter books have ( have become ）pretty popular since t_英语解答

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

人气：277 ℃　时间：2020-04-06 06:08:52

解答

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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