此句請幫忙找出主謂賓結構.是什麼類型的句子? 謝謝!

題目：

此句請幫忙找出主謂賓結構.是什麼類型的句子? 謝謝!
Indeed,what might Mercator have thought were it suggested to him that his scheme would one day be used to plot landscapes so far from terrestrial in aspect as to reflect back,in their magnificent alienness,the very idea of an old and exhausted earth?

解答：

全句爲主從複合句.
下面,順文章依次分析句子：
Indeed,what might Mercator have thought （由what引出主語從句）were （系詞）it （表語）suggested （過去分詞,做it的後置定語）to him that （由於suggest後面需要雙賓語,這裡的that引出直接賓語從句,前面的to him爲介詞短語）his scheme （從句中的主語）would one day be used to plot landscapes so far from terrestrial in aspect as （這裡的so 應當同後面的as聯繫起來看,意思爲「以致」,far from與後面的to聯繫起來看,far from ...to +動詞不定式）to reflect back,in their magnificent alienness,the very idea of an old and exhausted earth?（從in their magnificent alienness,...開始可以理解爲一句省略的問句.）
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