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Mr Bush is on time for everything. How _______ it be that he was late for the opening ceremony?
A．canB．should?
C．mayD．must?
A?
can表示“可能性”，含推測的意味，通常用于否定句或疑問句中，且有時還帶有“驚奇、不相信” 等感情色彩。
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