【单选】As a teacher,I seldom give my student

As a teacher , I seldom give my students so diffcult a problem _______ they cannot work out .
A.that B.if C.in order to D.as

请问为啥是d不是啊，谢啦
..打错了..是为什么选d谢了

if i were a teacher Aren’t I a teacher ? Success is not nearly as good a teacher as failure. as soon as i read "take bacon home"from a friend's article I'm going to buy a magazine about plants.That's great!I want to be a science teacher one day! I love you as long as I have a beath. she's a teacher , and a nurse ______ I`m teacher 和 I`m a teacher 有什么区别？ I have a dream of being a teacher 还是I have a dream of be a teacher. I'm not a teacher.He isn't a teacher,________