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【题目】I ______ play the piano when I ______ four years old

A. could wasB. can wasC. could am

【答案】A

【解析】

句意:当我四岁的时候我会弹钢琴了.根据 when I ______ four years old,可知意思是当我四岁的时候,这里应该是一个过去的时间,所以句子应该用一般过去时,be动词的过去式形式是were或者was,这里主语是I,所以应该用waswhen引导的从句用了过去式,那么主句也应该相应的用过去时,can的过去时could,在这里表示能,能够.故选A

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