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【题目】It has been three years since I ______ a teacher.

A. become B. became C. becoming D. to become

【答案】B

【解析】

句意:自从我成为一名老师以来,已经三年的时间。since引导一般过去时态的从句,表示自……以来,结合语境可知下文从句描述的是过去某时的动作,故用一般过去时态,A. become变得,一般现在时态;B. became变得,一般过去时态;C. becoming变得,现在进行时;D. to become变得,动词不定式。根据题意,故选C。

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