3．-Guess what!I have got A for my term paper. -Great!You read widely and put a lot of work into it. A．must B．should C．must have D．should have 解析:选C.句意:-猜猜有什么好消息!我的学期论文得了A.-真棒!你一定是博览群书并在此文上投入了很大精力.情态动词的用法是历年高考考点.从对话中可以看出此处应该是对过去动作的推测.should或must加动词原形表示对现在或将来的推测.应被排除,should have done(过去本应该做而未做某事)表虚拟或吃惊语气.与语境不符.也被排除,must have done表示对过去发生事情的肯定推测.符合题意.故选C. 【
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