Upon arriving home,I was surprised to find the papers I had had ______ was missing.

Upon arriving home,I was surprised to find the papers I had had ______ was missing.

题目
Upon arriving home,I was surprised to find the papers I had had ______ was missing.
A.to collect B.collected C.it collected D.to be collected
请详细说出理由.thanks!
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……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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