If you _____ smoke, please go outside because this is a non-smoking office.
A．mustB．shouldC．canD．may
A
考查情態(tài)動詞。句意“如果你非要吸煙，請你去外邊吸，因為這是無煙辦公室�！眒ust可表示“一定，非得，非要”的意思，故選A。
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