题目内容
20.--Must I return the book this morning?--No,you__.But you __return it before supper.( )
| A. | needn't; must | B. | mustn't; can | C. | mustn't; may | D. | can't; need |
分析 --我今天早上必须还这本书吗?
--不,你不需要.但是你必须晚饭前还回它.
解答 答案:A.考查情态动词.句意"--我今天早上必须还这本书吗?--不,你不需要.但是你必须晚饭前还回它.".第一个空,must开头的情态动词,否定回答通常用needn't,不需要.第二个空,表示必须晚饭前还回他,语气比较强烈.用must.答案是A.
点评 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语.要注意情态动词的不同用法.结合语境选择正确答案.
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