Mr.Bush is on time for everything.How __...

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

A 【解析】 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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