问题补充：
, he caught up with others.
A. With the help of the teacher’s
B. With the teacher’s help
C. By the teacher’s help
D. On the teacher’s help
答案：
A. With the help of the teacher’s
(答案→)B. With the teacher’s help
C. By the teacher’s help
D. On the teacher’s help
解析：句意：在老师的帮助下，他赶上了其他的同学。在某人是帮助下With one’s help或with the help of sb，故选B。
