“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
根據(jù) Don’t be so sure 可知前面一空應(yīng)填must。第二空填的could表示推測，雖為過去式形式，但表示現(xiàn)在意義，語氣較委婉，它與表推測的 can 主要用于否定句和疑問句不同，它可以用于肯定陳述句。
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