I ___a college student for more than a year.A became B have became C was Dhave been

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I ___a college student for more than a year.A became B have became C was Dhave been
I ___a college student for more than a year.
A became B have became C was Dhave been

I ___a college student for more than a year.A became B have became C was Dhave been
选D
for more than a year
要用现在完成时态
became 是短暂性动词,不能搭配一段时间

D have been
for more than +时间段 ...表现在完成时

D have been
有 for 表时间的句子宜用现在完成时.

D have been
表示已经持续了一年这个状态

have been
现在完成时