Eggs in western countries are often sold by . A. a dozenB. the dozenC. dozensD. dozen

问题补充：

Eggs in western countries are often sold by .

A. a dozen

B. the dozen

C. dozens

D. dozen

答案：

A. a dozen

(答案→)B. the dozen

C. dozens

D. dozen

解析：本题考查数词。by the dozen按打，固定用法。句意：在西方国家，鸡蛋是经常卖按打卖。