【題目】It _______ ten years since my sister ______ an English teacher.

A. has been, is B. is, became

C. have been, was D. is ,has become

【答案】B

【解析】試題分析：句意：我妹妹成為一名英語(yǔ)老師已經(jīng)十年了。since連詞，自從，引導(dǎo)時(shí)間狀語(yǔ)從句，后跟一般過(guò)去時(shí)態(tài)，而主句往往是現(xiàn)在完成時(shí)態(tài)或一般現(xiàn)在時(shí)態(tài)。所以選B。

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