题目内容
18.-Dad,must I finish my homework now?-No,you .It after supper.( )
| A. | don't have to,can do | B. | needn't,can do | ||
| C. | needn't,can be done |
分析 --爸爸,我现在必须完成作业吗?
--不,你不必.你可以吃完晚饭以后做.
解答 答案:C.
根据No,可知下面为否定回答,must的含义是必须一定,其否定形式mustn't表示禁止的含义.在这里不是禁止的意思.must的否定回答一般可借助于needn'和don't have to来构成,表不必;再根据It after supper,可知这里it指的是homework,它和do之间应该是被动关系,所以这个句子应该用被动语态,这里含有情态动词,结构为:情态动词+be+动词过去分词.故选C.
点评 本题考查了情态动词的用法.注意must的用法以及它的肯否定形式.
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