答案：B

题目分析：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。

点评：本题难度适中。介词短语也是高考的热点，需要考生平时多积累，注意它们的用法及区别。

即学即练：______, I was able to pass the test this time.

A. With the help of his

B. With his help

C. By his help

D. On his help

解析B：。句意：多亏了他的帮助,我这次的考试才得以过关。