---Look!It________beaUFO.---No,it________beaUFO.Obviouslyitisaplan

发布时间：2020-08-07 04:24:13

---Look ! It ________ be a UFO .---No, it ________ be a UFO. Obviously it is a plane.A.must; mustn'tB.might; can'tC.can; mustn'tD.can't; must

网友回答

B解析导解：表示推测时，must用在肯定句中；can/could用在否定句及疑问句中；may/might也用在肯定句中，但语气不如must强烈．
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