【题目】When she was in college, Sophia ______ as a teacher in the small town for several months.
A.had volunteeredB.volunteered
C.has volunteeredD.is volunteering
在线课程【答案】B
【解析】
考查动词时态。句意：当索菲亚还在上大学的时候，她曾在一个小镇上支教好几个月。根据时间状语从句When she was in college可知，表示事情发生在过去，动作已经结束，与现在无关，故排除C、D项；A项表示“过去的过去”，故错误。故B项正确。