题干
When asked to explain ________ he does to make his students so fascinated with his lessons, the teacher paused and thought deeply.
A：what it is that
B：that what it i
C：what is it that
D：that what is that
答案(点此获取答案解析）
A
（键线式：只用键线表示，如苯环：
），下列判断不正确的是 （ ）