首页 > 留学知识库

问题: 英语

He had been knocking at the door for a long
time,but on one came to open it.He said to himself ,"No one () indoors"
A must be
B can be
C may be

解答:

选 A must be 在肯定句中猜测肯定性最强,由句意选它
  其次,"No one () indoors" 实为否定句,但在这一样道理,
 暂时忽略No,看后面的句子one () indoors,则A.B.C.中

猜测肯定性最强的为A must be
    另:can't be 在否定句中猜测程度最强.
   综述,选 A must be~