—Who’s that boy reading in the study ? Is it David?—It __________ be David. I s
题型：不详难度：来源：
—Who’s that boy reading in the study ? Is it David?
—It __________ be David. I saw him go home just now.| A．must | B．can’t | C．may | D．shouldn’t |
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答案
| B |
解析
试题分析：句意: -在书房里读书的那个男孩是谁？是David吗？-不可能是David，我刚才看见他回家了。本题考查的是情态动词表示推测的用法。must 一定，肯定，只能用在肯定句中，表示一个很有把握的推测；can’t 不可能，语气较强，用在否定句中；may 可能，可以用在肯定或否定句中，语气较弱；shouldn’t 不应该。根据题意，说话人觉得那个人不可能是David，故选B。 |
举一反三
Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous.| A．mustn’t | B．ought not to | C．needn’t | D．don’t have to |
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— Dad, must we wait until the light becomes green?
— Yes, I’m afraid we ______. That’s the traffic rule.| A．can | B．may | C．have to | D．need |
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—Tom can’t find his gloves. Are these blue gloves his?
—No, they ______ be his. His gloves are black.
| A．must | B．may | C．can’t | D．mustn"t |
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— Must we send our plan this week?
— No, you ______.| A．mustn’t | B．can’t | C．shouldn’t | D．needn’t |
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— ______ you sing the English song?
— Yes, I can. But only a little. |
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