Since Jack was laid off from his job three months ago, he a new one, but without luck.
A. looked for
B. bad looked for
C. is looking for
D. has been loking for
网友回答
A. looked for
B. bad looked for
C. is looking for
(答案→)D. has been loking for
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，选D。