It ________be the vocabulary that caused you the problem in the exercise because
题型：不详难度：来源：
It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words. (2013·安徽，34)| A．may | B．couldn’t | | C．should | D．needn’t |
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答案
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解析
B
解析 考查情态动词。句意为：因为你掌握了大量的单词，所以使你在练习中产生问题的原因不可能是词汇问题。couldn’t 不可能。 |
举一反三
—Why are your eyes so red？You________have slept well last night.
—Yeah，I stayed up late writing a report. (2013·四川，5)| A．can’t | B．mustn’t | | C．needn’t | D．won’t |
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Since nobody gave him any help，he ________ have done the research on his own.
(2013·大纲全国，26) |
—You needn’t take an umbrella.It isn’t going to rain.
—Well，I don’t know.It________do. (2013·北京，35)| A．might | B．need | | C．would | D．should |
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Harry is feeling uncomfortable.He________too much at the party last night.(2013·辽宁，31)| A．could drink | B．should drink | | C．would have drunk | D．must have drunk |
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No one________ be more generous；he has a heart of gold. (2013·天津，9)| A．could | B．must | | C．dare | D．need |
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