题干
— Did you see the teacher come into the classroom?
一 No, I didn't I at that time.
A：slept
B：am sleeping
C：was sleeping
答案(点此获取答案解析）
C
— Did you see the teacher come into the classroom?
一 No, I didn't I at that time.
A：slept
B：am sleeping
C：was sleeping
He，每百吨
He的形式存在。下列说法正确的是( )
