2. 外语
  3. In the last ten years, the dropout rate among Black high school students fell substantially over the past decade, while the numb

In the last ten years, the dropout rate among Black high school students fell substantially over the past decade, while the numb

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问题 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.
选项 A、fell substantially over the past decade, while the number of Blacks who attend college is more than twice what it was
B、fell substantially, while the number of Blacks attending college is more than double what it was at that time
C、has fallen substantially, while the number of Blacks attending college has more than doubled
D、has fallen substantially over the past decade, while the number of Blacks attending college is more than twice what it was at that time
E、has fallen substantially over the past decade, while the number of Blacks who are attending college are more than double what they were
答案C
解析 由句首的时间状语in the last ten years，决定了主从句的时态都应用现在完成时，由此排除A、B、D。E中substantially之后的over时间短语与句首的in时间状语是重复表达。同时，D中is more than twice what it was的表达不好。C中，more than double简洁。E中double之后跟宾语的用法是错误的，因为double是不及物动词(可查阅“比较”中相关内容)。
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