题目内容
---Look ! It ________ be a UFO .
---No, it ________ be a UFO. Obviously it is a plane.
- A.must; mustn't
- B.might; can't
- C.can; mustn't
- D.can't; must
B
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.
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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