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【題目】It has been three years since I ______ a teacher.
A.become
B.became
C.becoming
D.to become

【答案】B
【解析】題意：現(xiàn)在完成時(shí)里，since從句里動(dòng)詞應(yīng)用一般過(guò)去時(shí)。故選B。

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