The video cameras are so nice.I really don't know_______.

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The video cameras are so nice.I really don't know_______.
A.how to choose B.what to choose
C.to choose which D.which to use
参考答案选D,为什么?
which不是只能引导定语从句吗？为什么这里可以引导宾语从句？

【答案】 D.which to use
I really don't know which to use我不知道选哪一个
which充当know的宾语
which既作代词,又有它本身“哪一个”的含义,所以不用what how
不定式to choose作后置定语修饰宾语which
which也能引导宾语从句,但这句不是【这句俗称简单句】,若改成宾语从句,如下：
I really don't know which video I should choose.

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