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it must have been....为什么用have而不用has
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推荐答案 2012-11-18
must后面跟原型啊,have是has的原型,所以用has
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其他回答
第1个回答 2012-11-18
must后面动词要变原型
第2个回答 2012-11-18
must 后面要加动词原形
第3个回答 2012-11-18
must后动词要原型……
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