theyweretired,they

发布时间：2020-07-27 08:19:44

________ they were tired, ________ they went on working．A.Though; butB.Though;/C.Because; andD.Although; but

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B解析在英语中，though和but不能同时使用，只能选择其一，结合句意，应选择B项。

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