【题目】After class, the teacher couldn’t leave, by the students.
A. surrounded B. to surround
C. was surrounded D. surrounding
在线课程【答案】A
【解析】考查非谓语作状语。句意：下课后，老师无法离开，因为被学生们围住了。分析句子可知，本句是省略句。主从句主语一致，从句的主语省略，而主语the teacher与动词surround二者是被动关系，be surrounded by…意为“被…..包围”。故要用过去分词作状语，故选A。