A-A+
Alexis______her Canadian dollars for Yuan Renm
问题详情
Alexis______her Canadian dollars for Yuan Renminbi before her trip to Beijing.
A．exchange
B．exchanged
C．exchanging
D．exchangeable
参考答案
正确答案：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。
