◎ 题干
Beethoven was walking in the street _______ he heard someone ________ his music.
[     ]
A. before, play
B. after, playing
C. when, playing
D. while, to play
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Beethoven was walking in the street _______ he heard someone ________ his music. [ ]A. before, play B. after, playingC. when, playingD. while, to play…”主要考查了你对  【连接代词】【现在分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。