公眾號：mywangxiao
及時(shí)發(fā)布考試資訊
分享考試技巧、復(fù)習(xí)經(jīng)驗(yàn)
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(zé)任編輯：中大編輯）
