【题目】It is not wise that a teacher stops his students ________ the room.
A.not to enter
B.from entering
C.not entering
D.to enter

【答案】B
【解析】 stop to do sth.“ 停下来去做另一件事 ”；stop sb.(from) doing sth。“阻止某人做某事”， 根据题意：一名老师阻止他的学生们进入教室是不明智的。只有B项符合该结构。