If you           spit at all, please spit in the bucket(痰孟里)provided
A．mustB．shallC．should D．may
A

試題分析：must 表必須，一定；shall表法律，條文規(guī)定的必須；should 應該；may可能，結(jié)合句意：如果你一定要吐痰，請吐在所給的痰盂里。故選A.
點評：情態(tài)動詞是一種本身有一定的詞義,表示說話人的情緒,態(tài)度或語氣的動詞,但不能單獨作謂語, 只能和其他動詞原形構(gòu)成謂語。can (could) 表示說話人能,可以,同意,準許,以及客觀條件許可；will, would用于疑問句表示說話人向?qū)Ψ教岢稣埱蠡蛟儐?用 would 比 will 更婉轉(zhuǎn),客氣。Shall, should表示命令,警告,允諾,征求,勸告,建議驚奇。
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