Alexis ______ her Canadian dollars for RMB before her trip to Beijing.

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问题 Alexis ______ her Canadian dollars for RMB before her trip to Beijing.

选项 A、exchange
B、exchanged
C、exchanging
D、exchangeable

答案B

解析此空需要填入一个动词，不是现在分词，也不是形容词，故排除C项和D项。句中动词需要根据句子的时态采用相应的形式，A项是动词原形，用在这里不恰当，排除A项。故本题正确答案为B。

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