问题
选择题
I ______ the poor rabbit, but I didn’t have the right drugs with me at that moment.
A．saved
B．had saved
C．could save
D．could have saved
答案
答案：D
考查情态动词表推测 我本可以挽救这只可怜的兔子的，但我当时没有合适的药品。could have done表示本可以做某事但实际上没做。是对过去动作的推测。