By the time she is 50 years old, she ______ an inmate of the prison for over half of ______ her life.

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问题 By the time she is 50 years old, she ______ an inmate of the prison for over half of ______ her life.

选项 A、would have been
B、will be
C、will have been
D、would be

答案C

解析 本题的考点是由介词by所引导的将来时间短语所决定的将来完成时态。当一个句子中出现介词by所引导的将来时间短语时,主句的时态应该用将来完成时态(will have done)。
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