公眾號：mywangxiao
及時發(fā)布考試資訊
分享考試技巧、復習經(jīng)驗
新浪微博 @wangxiaocn關(guān)注微博
聯(lián)系方式 400-18-8000
-What's your problem ?
- I have lost sight of my mum and dad . I saw them ________ in front of me a moment ago.
A. were walking B. to have walker C. walk D. walking
答案：D
相關(guān)內(nèi)容：
（責任編輯：中大編輯）
