—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
C
考察情態(tài)動詞表示推測。Must have done表示對過去發(fā)生事情的肯定推測。結(jié)合句意可知本題是對過去發(fā)生事情的肯定推測。句意：—一支醫(yī)療小分隊五天前飛去了日本�！敲吹浆F(xiàn)在他們肯定已經(jīng)到了日本了。
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