1、My friend ( )the answer to the question.A is know B know C knowing D knows

题目

1、My friend ( )the answer to the question.A is know B know C knowing D knows
2、I think I will buy there shoes.( )really well.
A They fit B They have fit C They are fitting D They were fitting
3、Don't worry.I( )be here to help you.
A not B shall C am not D won't
4、Mary ( )tennis once or twice a week.
A is playing usually B usually playing C usually plays D plays usually

答案

1、D,主语My friend是第三人称单数,动词应该要用三单式,其他选项A和C现在进行时的结构不对,B不是三单式
2、A
3、B,根据句意应该是他会留下来帮忙,其余选项都是不会留下来,故选B
4、C,主语Mary第三人称单数,动词用三单式,usually放前面是习惯用法