The next Olympic Games are in two years,____I will be a university student.

题目

The next Olympic Games are in two years,____I will be a university student.
A.on which time B,in which C.by which time D.which
求具体分析,

答案

C
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下一届奥运会在两年之内举行,到时我将是一个大学生啦.
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词组by the time ,到.时候为止
by which time 指代了,是定语从句的用法
那么同样这句话可以还原成两句：
The next Olympic Games are in two years
【By the time】I will be a university student.
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非限定从,引导词在从句中指代主句中的时间状语.因为是时间状语,所以只能用 when 或 which time 指代（先行词in two years）,而不能用单独的 which；又因为这个时间不是一个具体的日子,所以前面不能加 on.这样就只剩下 C 了.