I keep my books on the _____ (shelf) in my room.

问题描述:

I keep my books on the _____ (shelf) in my room.
这道题的答案是shelves 请问如果是shelf 不行吗?

我认为单数和复数都可以,因为一个书架可放很多书.
the 这,那,这些,那些(后可数单数名词也可接得数名词)
I keep my books on the (shelf) in my room.
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I keep my books on the (shelves) in my room.