Do you know the teacher who is having an English lesson. A. thatB. whomC. whichD. whose

问题补充：

Do you know the teacher who is having an English lesson.

A. that

B. whom

C. which

D. whose

答案：

(答案→)A. that

B. whom

C. which

D. whose

解析：英语定语从句中当先行词指人时,在从句中作主语的引导词可以用that或者who,故选A.