Every boy and every girl ______ that each day and each hour brings ______ duty.A.know,their B.knows,their C.knows,its D.

问题描述:

Every boy and every girl ______ that each day and each hour brings ______ duty.A.know,their B.knows,their C.knows,its D.know,

主语中间用and连接,是复数,排除B和C,选A答案是D