When he went to the airport for the ticket, ____________________ (汤姆才发现他的护照已经过期半年了).

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问题 When he went to the airport for the ticket, ____________________ (汤姆才发现他的护照已经过期半年了).

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答案Tom suddenly realized that his passport had expired for half a year

解析 本题主要考查复合句的时态和动词expire(到期)。在本句中,去机场发生在过去,那么realize也应用过去时态以保持前后时态一致,而护照到期则发生在realized之前,故应用过去完成时态。
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