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问题: 一道选择题!谢谢!

The noise of something________on the floor could be heart clearly in the quiet night.
A.being dragged
B.dragged
为什么选择A?而不选择B?
谢谢!

解答:

因为在地板上的噪声是被拖拉出来的,自己不能产生。原句子可改为这样,便于理解。
The noise of something that was dragged on the floor could be heart clearly in the quiet night.
从句变成分词短语。