is it "he must have fallen" or "he must have fell"?why

is it "he must have fallen" or "he must have fell"?why

题目

is it "he must have fallen" or "he must have fell"?why
thank you

答案

举一反三

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想找英语初三上学期的首字母填空练习……

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1,人们染上烟瘾,最终因吸烟使自己丧命.

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