--- Who ______ it be that is singing in the next room?
--- It _______ be Lucy, but I am not sure.
A．can ; mayB．may ; canC．can; mustD．must; may
A

試題分析：考察情態(tài)動詞。第一空用can表示可能性，can通常用于疑問句和否定句中。第二空用may，在肯德基中表示可能性很小的推測。句意：—在隔壁唱歌的會是誰呢？—也許是Lucy，但是我不確定。故A正確。
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(zhǔn)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表示命令,警告,允諾,征求,勸告,建議驚奇。
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