B
因为前面说到有一些书了,所以说不知道如何从中选,就是选“哪些”
如果没前面那句,就是what,不知道买什么.
其实这是因为考试,生活中两种说法都可以的,但是考试我们需要揣摩出题人的意思...
There are so many interesting books here.I really don't know
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