It is over 10 years since I _______(become) a teacher.动词适当形势填空

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It is over 10 years since I _______(become) a teacher.动词适当形势填空
It is over 10 years since I _______(become) a teacher.动词适当形势填空

It is over 10 years since I _______(become) a teacher.动词适当形势填空
since 后面加时间点,成为老师是过的事情,所以用became
意思:我当老师10多年了.

became

became
过去式

have been

became
since 后面加过去的时间点

have become 应该用完成时。