Alexis______her Canadian dollars for Yuan Renminbi before her trip to Beijing.

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问题 Alexis______her Canadian dollars for Yuan Renminbi before her trip to Beijing.

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

答案B

解析根据上下文可知横线上应该填人一个动词，所以现在分词exchanging和形容词exchangeable都不可能是正确答案。主语是第三人称单数，所以动词原形(exchange)也不可能是正确答案。排除法得选项(B)是正确答案。

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