题目

题型：不详难度：来源：

—A medical team was sent to Japan by air five hours ago.
—So they ______________ have arrived by now. The flight usually takes four hours or so.

A．might

B．could

C．must

D．need

答案

C

解析

考察情态动词表示推测。Must have done表示对过去发生事情的肯定推测。结合句意可知本题是对过去发生事情的肯定推测。句意：—一支医疗小分队五天前飞去了日本。—那么到现在他们肯定已经到了日本了。