David was bad at his studies, so when I was told he did well in the final exam this time, I found it really .
A. unbelievable
B. harmful
C. rude
D. fundamental
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(答案→)A. unbelievable
B. harmful
C. rude
D. fundamental
解析：考查形容词：A. unbelievable难以置信的，B. harmful有害的C. rude粗鲁的D. fundamental基本的，句意：大卫学习很差，所以有人告诉我他期末考试考的很好的时候，我感觉很难以置信。选A。