The actual figure was made of copper supported by a metal framework which had been especially constructed by Eiffel.
supported by a metal framework 修饰figure,过去分词作状语
这样因该是4正确
5、再加个饭后甜点,it was officially presented to the American people by Bartholdi.
to the American people 是否是主语补足语呢?
present sth to sb是present后双宾语结构
to the American people 是其中一部分啊