【題目】Mary is in a hurry because the train to the airport leaves __________ half an hour.

A. by B. in C. for D. until

【答案】B

【解析】

試題分析：考查介詞的使用。“in+一段時(shí)間”用于表示將來(lái)的句子中，意為“在……之后”。句意：瑪麗很著急，因?yàn)槿ワw機(jī)場(chǎng)的火車(chē)半小時(shí)后就發(fā)車(chē)了。故選B。

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