Question

—Have you seen Maragaret? The boss is looking for her everywhere.
—She________the train, otherwise she would have arrived here by now.

A．should have missed	B．must have missed
C．had missed	D．might miss

Answer 1

B

试题分析：考查情态动词表示推测。根据后面的otherwise she would have arrived here by now（要不然她就会到了）说明是对过去所发生的情况的推测。故使用“情态动词+have done”的形式。Should have done本应该做某事，实际上却未做；must have done一定做了某事；句意：—你看见Maragaret了吗？老板到处找她。—她一定错过了火车了，要不然，她会到了的。故B正确。
点评：情态动词的用法比较复杂。突出的是表示推测：如果是对现在的情况进行推测，使用“情态动词+动词原形”；对过去的情况进行推测，使用“情态动词+have done”；情态动词也经常用于虚拟语气，要分具体情况来分析，在条件句中和宾语从句，表语从句中都有体现。