Her grandpa was ill in bed_,she had to stay at home.A,so;B,since;_英语解答

Her grandpa was ill in bed_,she had to stay at home.A,so;B,since;C,so that;D,but.
请分别介绍一下这四个选项,

人气：100 ℃　时间：2019-10-17 14:19:28

解答

A
A是因果关系的结果
B是因果关系的原因（Since her grandpa was ill in bed,she had to stay at home）
C一般不这么用
D转折的并列关系