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

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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

B

a.

a