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— Is John coming over this weekend?
— He should, but he _______ not. He seems to be busy these days.
A．canB．mayC．mustD．will
B

試題分析：句意，這是兩個人之間的對話。第一個人說：“John這周末會來嗎？” 第二個人說：“他應該來，但是他可能不來。他看起來那些天很忙�！眂an能；may也表示可能性，may表示的可能性比can�。籱ust 必須； will表將來。這里表示可能性，且可能性不大，故選B。
點評：情態(tài)動詞本身不能單獨作謂語，只能和其它動詞構成謂語，表達特殊的功能和意義。在學習情態(tài)動詞時主要從其語法功能和特殊含義的歸納上下功夫，如情態(tài)動詞表示能力、情感態(tài)度和表示推測三種意義的用法差別等。
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