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—Look at these tracks. It __________ be a wolf.

—It needn't be. It ___________ be a fox.

A. must; could              B. may; might    

C. need; must               D. could; need

A


解析:

第一空的答案要根据答语来判断。“needn't'’的出现表明第一空为“must”。后一空表猜测,可以用could。

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