Question

Mr.Bush is on time for everything.How ________ it be that he was late for the opening ceremony....

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

Answer 1

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。