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一道英语语法单选~Thehumanbodyismadeupofover75%ofwater,wecanonlysurviveforacoupleofdays.A.withoutitB.withoutwhich为什么选B从句缺成分么?which不是占成分么

题目详情
一道英语语法单选~
The human body is made up of over 75% of water,____we can only survive for acouple of days.
A.without it
B.without which 为什么选B 从句缺成分么?which 不是占成分么
▼优质解答
答案和解析
从句不缺成分
we 主语
can survive.谓语
主谓齐了
which 作引导词,引导后面从句