The number of students in this college ______ this year.

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问题 The number of students in this college ______ this year.

选项 A、have doubled
B、has doubled
C、have been doubled
D、has been doubled

答案B

解析 the number of意为“……的数量”,“数量,总数”的谓语动词要用单数,指的是一个数字。而a number of意思为“很多,许多”,它修饰复数名词作主语时,谓语动词用复数。因为主语和谓语是主动关系,所以D不对。
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