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题目内容
（佳木斯大学语言治疗学）
—Look at these tracks. It _____ be a wolf.—It needn.t be. It _____ be a fox.( )
·must; could
·may; might
·need; must
·could; need
·must; could
·may; might
·need; must
·could; need
参考答案
