----How many pens would you like Madame?--Well I want these.A. three dozenB. three d

问题补充：

----How many pens would you like, Madame?

----Well, I want these.

A. three dozen

B. three dozen of

C. three dozens

D. three dozens of

答案：

A. three dozen

(答案→)B. three dozen of

C. three dozens

D. three dozens of

解析：句意：--夫人，你想要多少钢笔？--好，我想要这些里面的3打。Dozen“一打”，如果前面有具体的数字修饰dozen不用复数，如果修饰的是代词these，them，those或名称前面有限定词（one’s，the，these，those）修饰的话，dozen后面加of，选B。