题目

It was not a good idea to go skating. You __________your leg. A. can break                    B. could break C. could have broken             D. could have been broken   答案： C 本题关键为抓住题中提供的信息。“It was not a good idea'’表明动作发生于过去，情态动词后接动词完成式表明对过去动作的猜测。

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