---Ihaven'theardfrommysistersincelastmonth.---Don'tworry,Charlie

发布时间：2020-08-07 09:04:26

---I haven't heard from my sister since last month .---Don't worry, Charlie. Letters from the United States ________be slow sometimes.A.need toB.shouldC.canD.ought to

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C解析导解：can表示理论上、习惯上的“可能会，有时会”．
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