the teacher said to him,“I know that you came to my class on

the teacher said to him,“I know that you came to my class only once on the first day and that you
have been absent from all the others.Yet I have found only one small mistake in your paper.52 is that?” 为什么选how,不选why?
the teacher said to him,“I know that you came to my class only once on the first day and that you have been absent from all the others.Yet I have found only one small mistake in your paper.52 is that?”