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(dòng)作發(fā)生于過(guò)去，情態(tài)動(dòng)詞后接動(dòng)詞完成式表明對(duì)過(guò)去動(dòng)作的猜測(cè)。
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