. I ____ to the top of the tree, but I fell off it and hurt my leg.
A．must have climbedB．was able to climb
C．could have climbedD．should have climbed
C
本題考查情態(tài)動詞。句中could have done表示“本可以做”。句意：我本可以爬到樹頂，但我掉下來了腿受傷了。
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