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

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

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

-What's your problem -I have lost sight of my mum and dad .i saw them__in front of me a momont agoA.were walking B.to have walked C.walking 选项和具体解释 为什么要选这个
选C.see sb doing 看见某人正在做某事.
你有什么事吗?----我找不到我的爸爸和妈妈了,片刻之前,我还看见他们在我前面走着.

c

c

C。see sb do 或者 see sb doing sth.没有B选项那种用法,A 选项多谓语动词。

用walking, see sb doing sth, 表示see 和 walk 两个动作是同时发生的