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单项选择 We're trying to ring you back, John, but we think we _____ your number incorrectly. looked up B. took down C. worked out D. brought about What a pity! I _______ in Hainan two more days, but something urgent needed to be dealt with back home. A. must have stayed B. needn't have stayed C. may have stayed D. could have stayed --Tom is never late for work. Why is he absent today? --Something ________ to him. A. must have happened B. must happen C. should have happened D. could have happened Helen _____ go on the trip with us, but she isn't quite sure yet. A. shall B. must C. may D. can I was really anxious about you. You _______ home without a word. A. mustn't have left B. shouldn't have left C. couldn't have left D. needn't have left --Isn't that Ann's husband over there? --No, it _____ be him. I'm sure he doesn't wear glasses. A. can't B. must not C. won't D. may not | 
