【題目】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

【答案】D

【解析】考查時態(tài)。句意：李華去美國度假以前他把錢換成美元。根據(jù)句意可知用過去完成時態(tài)，故選D。

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