She tried tolaughing but it didn’t work;the performer gave her an angry look at her.A. pre

问题补充：

She tried tolaughing，but it didn’t work;the performer gave her an angry look at her.

A. prevent

B. stop from

C. stop

D. keep

答案：

A. prevent

(答案→)B. stop from

C. stop

D. keep

解析：stop from意为“忍住”。故不选C。