—When your sister the computer?—Last month.A. does, buys B. did, buy C. did, buys

发布时间：2020-08-20 08:36:51

—When     your sister      the puter?  —Last month.
A. does, buys               B. did, buy             C. did, buys

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解析：从答语Last month.上个月来看，前面问句应是过去时态，一般现在时态，第三人称动词后面加s，所以选B.
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