---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.mightB.couldC.mustD.need
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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。