（）toothache,theoldmanfeltverybitter,haingnogoodsleep.a.notbeingridofb.notridof答案是这么写的：rid常构成ridsbofsth和beridofsth,这里rid和逻辑主语theoldman之间是动宾关系,所以用过去分词,

Question

（ ）toothache,the old man felt very bitter ,haing no good sleep.
a.not being rid of
b.not rid of
答案是这么写的：rid 常构成rid sb of sth 和 be rid of sth ,这里rid和逻辑主语the old man 之间是动宾关系,所以用过去分词,
我看不懂,能再帮我分析一下吗

Answer 1

这里过去分词表被动,因为主语是the old man,和rid是被动关系,所以用B