英语句式分析,后半句做句子什么成分?I would be grateful if you could find a single room for me , preferably not in the same building but as near to the college campus as possinle. 逗号的后半句在整个句子中是什么成分?是省略了which is 吗?

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英语句式分析,后半句做句子什么成分?
I would be grateful if you could find a single room for me , preferably not in the same building but as near to the college campus as possinle. 逗号的后半句在整个句子中是什么成分?是省略了which is 吗?