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【題目】 The real reason why prices ____ , and still are, too high is complex, and no short discussion can satisfactorily explain this problem.

A. were B. will be

C. have been D. had been

【答案】A

【解析】試題分析：句意：過去和現在價格一直居高不下的真正原因很復雜，簡短的討論解釋這一問題無法讓人滿意。根據題干中“and still are”的提示可知過去價格也居高不下，故用一般過去時，表示過去的狀態(tài)。故選A項。

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