【題目】— 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

【答案】C
【解析】句意:——這些天你的功課怎么啦?——我已經(jīng)盡力了,但是我不明白為什么我仍然得這么低的分數(shù)。根據(jù)句意可知選C。

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