【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】句意:過(guò)去和現(xiàn)在價(jià)格一直居高不下的真正原因很復(fù)雜,簡(jiǎn)短的討論解釋這一問(wèn)題無(wú)法讓人滿意。根據(jù)題干中“and still are”的提示可知過(guò)去價(jià)格也居高不下,故用一般過(guò)去時(shí),表示過(guò)去的狀態(tài)。故選A項(xiàng)。

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