Approaching the city centre , we saw a stone statue of about 10 metres in height.你的句子带有分词结构,这个分词结构表示的是时间概念,完全可以改写成:When we approached--- -- 或者:As soon as we approached - - - -- .这样的时间状语从句。
又如:Working here, he got to know my sister.=== When he worked here,he got to know my sister.
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