There were books everywhere____dirt.A were covered by B covering with C which covered with D covered with为什么不选C项呢?

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There were books everywhere____dirt.A were covered by B covering with C which covered with D covered with为什么不选C项呢?
There were books everywhere____dirt.
A were covered by B covering with C which covered with D covered with
为什么不选C项呢?

There were books everywhere____dirt.A were covered by B covering with C which covered with D covered with为什么不选C项呢?
D

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