核心问题
You must refrain to spit in the street. 你必须避免在街上吐痰。
这个句子据说有误,请分析。
词典解答
refrain 本身是个不及物动词,必须与介词 from 连用。因此,上面的句子应改为:
You must refrain from spitting in the street.
类例：
Please refrain from smoking during the performance. (LDCE) 演出时请不要吸烟。
练习题
请做下面的英语试题：
Would you please ____ from smoking while the lecture is in progress?
A. avoid B. refrain C. stop D. keep yourself(Nelson, 500A)