Question

【题目】— What's wrong with your lessons these days?
— I have tried my best, but I don't understand ______ I still get so low marks.
A.that
B.whether
C.why
D.how

Answer 1

【答案】C
【解析】句意：——这些天你的功课怎么啦？——我已经尽力了，但是我不明白为什么我仍然得这么低的分数。根据句意可知选C。