题目内容
17.There's no light on-they be at home.( )| A. | can't | B. | mustn't | C. | needn't | D. | shouldn't |
分析 翻译:没有灯光,他不可能在家.
解答 can't表示不可能;mustn't表示不准;needn't表示不需要;shouldn't表示不应该.根据语境和句意没有灯光,他不可能在家.故选:A
点评 本题考查情态动词.can表示能力只有一般现在时和一般过去式;must表示必须,在回答引出的问句时,如果是否定的,不能用mustn't(禁止,不准),而用needn't,don't have to(不必);need表示需要,作情态动词用时,常用于疑问句、否定句;should 用于第二、三人称,表示说话人给对方的命令、警告、允诺或威胁.
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