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(yīng)該；may可能，結(jié)合句意：如果你一定要吐痰，請(qǐng)吐在所給的痰盂里。故選A.
點(diǎn)評(píng)：情態(tài)動(dòng)詞是一種本身有一定的詞義,表示說(shuō)話人的情緒,態(tài)度或語(yǔ)氣的動(dòng)詞,但不能單獨(dú)作謂語(yǔ), 只能和其他動(dòng)詞原形構(gòu)成謂語(yǔ)。can (could) 表示說(shuō)話人能,可以,同意,準(zhǔn)許,以及客觀條件許可；will, would用于疑問(wèn)句表示說(shuō)話人向?qū)Ψ教岢稣?qǐng)求或詢問(wèn),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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