【题目】Li Hua ____ his money for dollars before he went on a holiday in America.
A. exchanges B. has exchanged
C. will exchange D. had exchanged
在线课程【答案】D
【解析】考查时态。句意：李华去美国度假以前他把钱换成美元。根据句意可知用过去完成时态，故选D。
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