16.— Peter graduated from college at a very young age.

— He _____ have been a clever student.（  ）

A.could

B.must

C.should

D.might

16.B【解析】could/might “可能”；should“应该”；must“一定”；题干上句句意为“Peter年纪很小就从大学毕业了”，因此下句应接表示肯定的推断“他一定是个聪明的学生”。故选B。

17.Today is Mary’s wedding day.She _____ to John.（  ）

A.just had been married

B.has just been married

C.just married

D.has just married

17.B【解析】题干中的“today”说明本句时态为现在时，A选项为过去完成时，故排除；“marry”作动词时为及物动词，可直接跟宾语，而题干中“to John”可知需用“be married to sb”的固定搭配，排除C和D。故选B。

18.—Tom can take his toy apart and put it back together again.

—Really？I certainly wish he _____ me now.（  ）

A.teaches

B.will teach

C.has taught

D.would teach

18.D【解析】句意：—Tom能把他的玩具拆开再重新组装起来。真的吗？—我希望他可以教教我。表示对将来发生事情的愿望，应用“主语+wish+从句主语+would/could/might+动词原形”的句式。故D选项符合题意。