试题题干
（）is the main reason why many highly skilled workers from around the world went to the U.S.
参考答案
正确答案：
试题解析
较高的工资吸引了来自世界各地的许多技艺精湛的工人，他们纷纷来到美国。答案为C
（）is the main reason why many highly skilled workers from around the world went to the U.S.
较高的工资吸引了来自世界各地的许多技艺精湛的工人，他们纷纷来到美国。答案为C