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

题目简介

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

题目详情

They all appeared ___ this song before.
A.to learnB.to have learnedC.to not have learnedD.not learning from
题型:单选题难度:偏易来源:不详

答案

B
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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