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Mr.Bush is on time for everything.How ________ it be that he was late for the opening ceremony.
A.canB.shouldC.mayD.must
A

can表示可能性的推测,常用于疑问句或否定句中;may表“可能性”常用于肯定句或否定句中,must常用于肯定句中表推测,“一定……”的意思。注意:can not表示“不可能”,而may not表示“或许不……可能不……”,两者语气上有区别。
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