1) must表示必须,否定回答时用needn’t. mustn’t表示不许可。 【例如】 you must get to the station before 3, otherwise you will miss the train.must i hand in my homework tomorrow? no, you needn’t. you can turn it in the day after tomorrow. you mustn...
A. needn't have done B. must not have done C. shouldn't have done D. can not have done 10、The weather turned out to be fine yesterday. I ___ the trouble to carry my umbrella with me. A. should have taken B. could have taken C. needn't have taken D...
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