--How did you do in the test ?--Not so well. I much better but I misread the dire

问题补充：

----- How did you do in the test ?

----- Not so well. I much better but I misread the directions for Part D.

A. could have done B. could do C. must have done D. should do

答案：

解析：考查情态动词。对过去时态的推测，用情态动词+ have done，A本能够做；C过去一定做。句意：——你考试做得怎么样？——不太好。我本能够做得更好的，但我读错了D部分的说明。故A正确。