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foritlookedonsympatheticallyuntilthedrunkwasoutofthewaybeforeoncemoreturningitsattentiontothematador.这里的turn为什么要加ing呢

题目详情
for it looked on sympathetically until the drunk was out of the way before once more turning its attention to the matador.
这里的turn为什么要加ing呢
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答案和解析
before turning its attention to the matador.
before 后边,要么是句子,要么是动名词,要么就是名词,带动名词的时候主语与主句一致的时候可以省略.所以这里的turning就是动名词,省略了主语.