Question

I don't know ________．

1. A.
   that I have passed the exam
2. B.
   if I had passed the exam
3. C.
   what marks have I got in the exam
4. D.
   how well I did in the exam

Answer 1

D
若是A选项，应该把that改为if．若是B选项，应把过去完成时改成现在完成时．若是C选项，语序应改为陈述句语序．所以A、B、C三个选项都是错误的．