一I heard that you got an A in the chemistry examWell done!一Thanks I know that youa good j

问题补充：

一I heard that you got an A in the chemistry exam．Well done!

一Thanks，I know that youa good job as well．

A. shouId have done

B. need have done

C. must have done

D. could have done

答案：

A. shouId have done

B. need have done

(答案→)C. must have done

D. could have done

解析：考查情态动词用法。A本应该做某事实际上去没有做；B本需要做实际上却未做；C一定做了某事；D本可以做却未做。句意—我听说在化学考试中你得了A。做得好。—谢谢。我知道你也一定做的很好。