After school we went to the reading-room to do some reading, only to be told that it .A. w

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A. was decorated
B. had decorated
C. had been decorating
(答案→)D. was being decorated
解析：考查时态。句意：下课以后，我们去了阅览室看书，结果却被告知阅览室正在被装修。根据句意是指在我们去阅览室这个过去的时间正在发生的事情，故使用过去进行时。阅览室正在被装修，又要使用被动语态的形式。故D正确。