Question

-- 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．need

D．must

Answer 1

D

試題分析：句意：一個醫(yī)療隊在5個小時前已經(jīng)派往日本。所以他們到現(xiàn)在為止肯定已經(jīng)達到了，航班通常是花費4個小時的。must have done肯定已經(jīng)做了某事，表示對過去的肯定推測。故選D
點評：情態(tài)動詞是中考的熱點，情態(tài)動詞除了表推測外，還可以表達另外的意思，如must理解為必須，由這個詞所開頭的問句，肯定回答用Yes,you must.否定回答用No,you needn’t或者是No,you don’t have to.注意不用mustn’t，因為mustn’t表示例行禁止的含義。