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Since 1986 enrollments of African Americans, American Indians, and Hispanic Amer
Since 1986 enrollments of African Americans, American Indians, and Hispanic Amer
游客
2025-02-25
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问题
Since 1986 enrollments of African Americans, American Indians, and Hispanic Americans in full-time engineering programs in the United States
has steadily increased, while the number of other students who enter the field has fallen
.
选项
A、has steadily increased, while the number of the students who enter the field has fallen
B、has steadily increased, while other students entering the field have declined in number
C、increased steadily, while there was a decline in the number of other students entering the field
D、have steadily increased, while the number of other students entering the field has fallen
E、have steadily increased, while that of other students who enter the field fell
答案
D
解析
跳过enrollments之后的of到states之间的部分(这一长串都是对enrollments的修饰),本句的结构就极其简单。A、B错,因为主语enrollments是复数形式,谓语应用have,而不是has;C中的increased所反映的时态不对,因为since 1986这一时间状语及句意都表明该句应用现在完成时态;E前半段是正确的,但在while从句中有两处明显的错误:(1)that指代不正确,主句中的enrollments是复数形式,避免重复的指示代词应用those,而非that;(2)while从句中用了过去时态而非题意需要的现在完成时;D中前后都用完成时态,前面用have对应enrollments,后面用has对应the number of词组,因而是正确的。请注意:在D中while从句中,students后的修饰词从A中的who从句改为了一个分词短语,这一变动使得D项更加简洁,强调enter的动作与has fallen的动作是同时的,而从句只能表示现在的状态(从句与现在分词的区别会在分词一章重点提及)。
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