3道英语选择题,为什么这么选?

题目

3道英语选择题,为什么这么选?
1、Oh,it is ____ 7:00pm!I have to go now.
A.only B,already C.yet D .just
2、Is Peter here?
No,but he ____ be here now.He is late again.
A.would B.may C.must should
3.Jane likes singing.We often hear her ____ after class
A.sing B to sing C.sings D.sang

答案

1.B 后句意思是我必须要走了,可知前句应为“应经7点了”.only意为只有,already意为已经,yet用在否定句中意为还没,just意为刚刚.遂选B already.2.D Peter在吗?不在,但是,他现在（ ）在这里.他又迟到了.由句意可知此处...