Seeingtheirteachertotheclassroom，theystoppedatonce．（）A.walk，talkingB.entering，tosayC.walking，talkingD.enter，talking

Question

Seeing their teacher _________ to the classroom，they stopped ________ at once．（　　）

A. walk，talking

B. entering，to say

C. walking，talking

D. enter，talking

Answer 1

答案：C  see sb．doing sth．看到某人正在做某事，see sb do sth．看到某人做了某事，强调动作的全过程结合上半句句意：是看见老师正走进教室，应该用see sb．doing sth；stop to do是停下（手头的事情）去做另外...