________age twenty, Robert Kelly left KCRA, Inc. to enroll________the University of California at Davis.

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问题 ________age twenty, Robert Kelly left KCRA, Inc. to enroll________the University of California at Davis.

选项 A、At; at
B、At; in
C、Upon; in
D、On; at

答案A

解析 本题考查介词。表达年龄时,具体的年岁用介词at,在某个年龄段用介词in,故第一个空应填at。“注册(入学)”最常用的表达为enroll at university,故答案为A项。
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