【题目】Since Jack was laid off from his job three months ago, he _____ a new one, but without luck.
A. looked for B. had looked for
C. has been looking for D. is looking for
在线课程【答案】C
【解析】
考查时态。句意：自从杰克三个月前被解雇后，他一直在找个新的工作，但是不走运。时间状语是since引导的，主句应该是现在完成时或现在完成进行时，这里强调动作一直在进行而且可能还要进行下去，用现在完成进行时，故选C。