问题描述:
-What's your problem -I have lost sight of my mum and dad .i saw them__in front of me a momont ago
A.were walking B.to have walked C.walking
选项和具体解释 为什么要选这个
A.were walking B.to have walked C.walking
选项和具体解释 为什么要选这个
问题解答:
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