【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,已經(jīng)三年的時間。since引導(dǎo)一般過去時態(tài)的從句,表示自……以來,結(jié)合語境可知下文從句描述的是過去某時的動作,故用一般過去時態(tài),A. become變得,一般現(xiàn)在時態(tài);B. became變得,一般過去時態(tài);C. becoming變得,現(xiàn)在進行時;D. to become變得,動詞不定式。根據(jù)題意,故選C。

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