Measures to stop housing prices from rising too fast, but it remains to be seen whether th

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A. are taking
B. had been taken
C. have taken
(答案→)D. are being taken
解析：考查名词。根据句意可知用现在进行时态，表示正在发生的事情，主语measures与动词take指为被动关系，故用现在进行时的被动语态。句意：正在采取措施来阻止房价上涨太快，但它们是否奏效还有待见证。故D正确。