指定代词,代前述句中的the air
原因状语从句because the air there is much fresher than that in the city.
就从句本身成分再来分析：
the air there是主语
is是表语
much fresher是宾语
than that in the city是比较状语从句简略成比较状语短语.
指定代词,代前述句中的the air
原因状语从句because the air there is much fresher than that in the city.
就从句本身成分再来分析：
the air there是主语
is是表语
much fresher是宾语
than that in the city是比较状语从句简略成比较状语短语.