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---Look at these tracks. It be a wolf. ---Don’t be so sure. I think it be a fox.

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---Look at these tracks. It be a wolf. ---Don’t be so sure. I think it be a fox.

---Look at these tracks. It _____ be a wolf.”

---Don’t be so sure. I think it _____ be a fox.

A.must; couldB.may; mightC.need; mustD.could; need

试题答案

A

解析