Most European countries--including those of Bulgaria and Romania--have joined the European Union; Norway and Switzerland, however, have steadfastly refused to do it.
这个地方我觉得用do it应该没有问题啊?do指代前面的join,而it则是欧盟不对吗?
曼哈顿的解释是说it指代了整个“joined the European Union ”,我次奥这是什么情况?!