He did a research to________the reason why the paper turned green. A.work out B.find out C.get out D...
2022-07-01 06:19:08 161次 河北省邯郸市2019-2020学年九年级下学期3月月考英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
He did a research to________the reason why the paper turned green.
A.work out B.find out C.get out D.look out
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