这个英语句子的主语在哪With the declining preformance of american studen

把原句改为With the declining preformance of american students in math and sciences， increased competition form students from other countries that have strongly support education in these areas has come.你会发现，句子主语是increased competition form students from other countries that have strongly support education in these areas，这其中的 that have strongly support education in these areas作定语修饰increased competition form students from other countries。