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    精英家教网 > 高中英语 > 题目详情
    “Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
    A．must; couldB．may; might
    C．need; mustD．could; need
    A
    根据 Don’t be so sure 可知前面一空应填must。第二空填的could表示推测，虽为过去式形式，但表示现在意义，语气较委婉，它与表推测的 can 主要用于否定句和疑问句不同，它可以用于肯定陈述句。
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