题目内容
17．You can describe how things could have happened differently if circumstanceshad been different．（be）你可以描述一下在不同的情况下事物会如何发生不同．
分析 你可以描述一下在不同的情况下事物会如何发生不同．
解答 答案：had been different．
根据前面的how引导的宾语从句中谓语动词的形式could have happened可知，这是对过去事实的猜测，所以if引导的条件状语从句中的时态应该使用过去完成时；故答案为could have happened．
点评 本句实际上是考查虚拟语气中条件状语从句中的时态的运用，要分清具体是对什么事实的猜测，然后再判断主从句中时态的选择．
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