—How did you do on the test?
—Not so well. I much better, but I misread the directions for Part One.
A. could
B. could have done
C. must have done
D. should do
网友回答
A. could
(答案→)B. could have done
C. must have done
D. should do
解析：
这题考查情态动词的虚拟语气，could have done“本可以做…却没有”，句意是：--你考试怎样？--不是很好，我本可以更好，但是我误解了第一部分的说明。