---- May I smoke here?
---- If you      , choose a seat in the smoking section

A．should B．could C．must D．may

C

解析試題分析:考查情態(tài)動(dòng)詞。A 應(yīng)該；竟然 B 能夠，可能； C 必須，偏偏，非得；D 可以，可能。If you must（do sth）是固定短語(yǔ)，意思“（表示雖不贊同但可允許）如果你一定要（那么做）”，故C選項(xiàng)正確。句意--我可以在這兒吸煙嗎？—如果你非要吸煙的話，去吸煙區(qū)找個(gè)座位吧。
考點(diǎn)：考查情態(tài)動(dòng)詞。

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