---Look at these tracks. It _____ be a wolf.”
---Don’t be so sure. I think it _____ be a fox.
| A．must; could | B．may; might | C．need; must | D．could; need |
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---Look at these tracks. It _____ be a wolf.”
---Don’t be so sure. I think it _____ be a fox.
| A．must; could | B．may; might | C．need; must | D．could; need |
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