问题
选择题
. I ____ to the top of the tree, but I fell off it and hurt my leg.
A．must have climbed
B．was able to climb
C．could have climbed
D．should have climbed
答案
答案：C
本题考查情态动词。句中could have done表示“本可以做”。句意：我本可以爬到树顶，但我掉下来了腿受伤了。