问题
选择题
Mr Bush is on time for everything. How _______ it be that he was late for the opening ceremony?
A．can
B．should
C．may
D．must
答案
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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