【题目】—You could have asked Mrs Zhang for advice, for she is an expert at it.
—Yes, a whole day ________.
A.will be wasted
B.would be wasted
C.had been wasted
D.was wasted

【答案】D
【解析】根据虚拟语气could have asked可见，是浪费了一整天的时间，指过去的事情，“本可以问，事实却没问”，could have asked结构带轻微的责备。根据句意可知用一般过去时态的被动语态，表客观事实，故选D。