His teacher is the only one he can turn when he is in trouble.A. in whomB. to whomC. for

问题补充：

His teacher is the only one he can turn when he is in trouble.

A. in whom

B. to whom

C. for whom

D. from whom

答案：

A. in whom

(答案→)B. to whom

C. for whom

D. from whom

解析：本题考查定语从句。turn to sb想某人求助。