Theyallappeared___thissongbefore.A

发布时间：2020-07-25 09:48:02

They all appeared ___ this song before.A.to learnB.to have learnedC.to not have learnedD.not learning from

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B解析此处的appeared意为:看来,后可接不定式.根据后面的before得知,这里要用被动结构 to be learned
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