It was not a good idea to go skating. You __________your leg.
A．can breakB．could break
C．could have brokenD．could have been broken
C
本題關(guān)鍵為抓住題中提供的信息�！癐t was not a good idea'’表明動作發(fā)生于過去，情態(tài)動詞后接動詞完成式表明對過去動作的猜測。
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