问题
选择题
_____ is known to us all is that America is a developed country _____ the First World.
A．Which; belonging to
B．as; belonging to
C．what; belonging to
D．It; belonging to
答案
C
我们都知道美国是属于第一世界的发达国家。第一空是主语从句；第二空是现在分词短语作定语。