题目内容
16．-Who's singing in the garden？-It ________ be Tom．He always practices singing at this time．（ ）
| A． | can't | B． | need | C． | must | D． | mustn't |
分析 句意：--谁正在花园里面唱歌？
--一定是汤姆．他总是在这个时间练习唱歌．
解答 答案：C．：can't不能；need需要；must必须，一定；mustn't，不一定，不可以．根据He always practices singing at this time．可知他总是在这个时间练习唱歌．是一种肯定的推测，而且可能性很大，所以在这里用must．故选C．
点评 本题考查了情态动词的用法．解答时，应正确理解题意并作出正确的判断．本题应注意must的用法．
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