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英语语法结构问题We were interested in the extent to which ocular dri

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英语语法结构问题
We were interested in the extent to which ocular drift and, particularly, ocular microtremor are due to central drives tending to synchronise extraocular muscle unit discharge at particular frequencies.
上面这句话中,to which, tending to, discharge 都是什么语法结构啊?
to which 引导的是定语从句,介词to是因为to the extent,tending是分词短语作定语,discharge是动词原形.
再问: to synchronise之间是不是省which的宾语从句用法?
再答: 不是宾语从句,tend to do是词组。