【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】

句意：自從我成為一名老師以來(lái)，已經(jīng)三年的時(shí)間。since引導(dǎo)一般過(guò)去時(shí)態(tài)的從句，表示自……以來(lái)，結(jié)合語(yǔ)境可知下文從句描述的是過(guò)去某時(shí)的動(dòng)作，故用一般過(guò)去時(shí)態(tài)，A. become變得，一般現(xiàn)在時(shí)態(tài)；B. became變得，一般過(guò)去時(shí)態(tài)；C. becoming變得，現(xiàn)在進(jìn)行時(shí)；D. to become變得，動(dòng)詞不定式。根據(jù)題意，故選C。

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