Many a student ________ failed in the biology exam，and Tom is the only one of them who ________ decided to give up the course.

A．have；has　

B．have；have

C．has；have　

D．has；has

对船舶的入境检疫，在日出后到日落前的时间内实施，凡具备船舶夜航条件，夜间可靠离码头和装卸作业的港口口岸，应实行二十四小时检疫。对来自疫区的船舶，实行夜间检疫。 ( )