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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”,含推测的意味,通常用于否定句或疑问句中,且有时还带有“惊奇、不相信” 等感情色彩。
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