XDF语法教程的P220第3题
In the last ten years, the dropout rate among Black high school students fell substantially over the past decade, while the number of Blacks who attend college is more than twice what it was.
答案为E has fallen substantially over the past decade, while the number of Blacks who are attending college are more than double what they were.
我觉得the past decade 和上面的the last ten years 重复了，另外，the number of ...的谓语动词应该单数吧。
所以觉得选项C更佳 has fallen substantially, while the number of Blacks attending college has mroe than doubled
so do I, i aggree with the choice C
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