Question

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

A. has been, is B. is, became

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

Answer 1

【答案】B

【解析】试题分析：句意：我妹妹成为一名英语老师已经十年了。since连词，自从，引导时间状语从句，后跟一般过去时态，而主句往往是现在完成时态或一般现在时态。所以选B。