Question

1.he didn't speak to me,let alone__me.A.help B.to help c.hel

Answer 1

1.选A,let sb do sth

2.选A,相当于Once a bad habit was formed

3.选C,imagine +doing,其他词无此用法

5.选B,used to do 通常；这里是它的被动形式

6.选 A,相当于when water is heated