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请问句中的to作句子什么成分?Theschemeseemsonthesurfacetobequiteparctical.

题目详情
请问句中的to 作句子什么成分?
The scheme seems on the surface to be quite parctical.
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答案和解析
句子可调整为
The scheme seems to be quite practical on the surface.
to be quite practical为seems的表语.一起构成系表结构.