Whatever his former conduct ______, his circumstance should exempt him from rebuke now.

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问题 Whatever his former conduct ______, his circumstance should exempt him from rebuke now.

选项 A、may have been
B、can be
C、had have been
D、could have been

答案A

解析虚拟语气题。“情态动词+完成时”表示对过去的事情做结论、推测、判断。这里表示作结论。这句话从句是过去时，主句表示现在，也就是我们所说的错综时态虚拟，所以选项B 和C 不合语法。选项A 和D 合乎语法，但是在语义上有差别，前者表示的不确定的成分比后者多一些，与题意相符，所以选择A 。

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