Shortly after the accident,_____ police were sent to the spot to keep order.A.dozens of B.dozen

问题描述:

Shortly after the accident,_____ police were sent to the spot to keep order.A.dozens of B.dozen

A dozens of 表示几十个, 由后面的were看出,要用复数. 如果选B的话,则要用a dozen of .表示许多,一打( 12.3个.)