题目选项分析

A March 2000 Census Bureau survey showed that Mexico accounted for more than a quarter of all foreign-born residents of the United States, having the largest share to have been contributed by any country since 1890, when about 30 percent of the country's foreign-born population was from Germany.

A March 2000 Census Bureau survey showed that Mexico accounted for more than a quarter of all foreign-born residents of the United States, the largest share that any country has contributed since 1890, when about 30 percent of the country's foreign-born population was from Germany.