I am not to blame,for this is the first time that I a silly mistake(make)

题目

I am not to blame,for this is the first time that I a silly mistake(make)
怎么填的,还有前面的I am not to blame是什么用法?

答案

1.be to blame固定用法,主动形式,被动意义“该受责备”.
2.this is the first time that I （have made ）a silly mistake.本结构中,that 从句中一般用完成时.