— Is Jack on duty today? — It ________ be him. It"s his turn tomorrow.A．mustn"t
题型：不详难度：来源：
— Is Jack on duty today?
— It ________ be him. It"s his turn tomorrow.| A．mustn"t | B．won"t | C．can"t | D．needn"t |
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答案
| C |
解析
试题分析：考查情态动词表示推测：句意：--今天杰克值日吗？--不可能是他。明天该轮到他。Can’t be用于否定推测“不可能是”，must表示推测的时候，表示“肯定是”，won’t不愿意，needn’t不必，选C。 |
举一反三
—“Crash diets” make us lose weight fast and I am all into that.
—But it_______better to work out. | A．had | B．would be | C．wouldn’t have been | D．must have been |
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— May I smoke here?
— No, you ________. Can’t you read the sign “NO SMOKING”?| A．mustn’t | B．won’t | C．needn’t | D．Don’t have to |
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-- What’s wrong with your pen?
-- The ink ___________ come out.| A．can’t | B．won’t | C．hasn’t | D．doesn’t |
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You"d better take a heavy coat. Sometimes it ______ be very cold.| A．should | B．can | C．will | D．must |
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– I ran 10 miles last weekend. Can you believe that?
– Wow, that ______ easy!| A．mustn" t be | B．mustn"t have been | | C．can"t have been | D．couldn’t be |
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