Mr. Smith is always on time for everything. How ________ it be that he was late for the flight?

A．can B．must C．may D．need

A

解析試題分析：考查情態(tài)動詞。A可能；B一定；C也許；D需要。句意：史密斯先生任何事都很準(zhǔn)時，怎么可能他會延誤航班呢？ 故A正確。
考點(diǎn)：考查情態(tài)動詞

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