They sold boxes of such sweets last week.A. four dozens ofB. four dozenC. four dozen ofD.

问题补充：

They sold boxes of such sweets last week.

A. four dozens of

B. four dozen

C. four dozen of

D. four dozens

答案：

A. four dozens of

(答案→)B. four dozen

C. four dozen of

D. four dozens

解析：dozen与数词连用时，不加s，且不与of连用，故选B。