Since Jack was laid off from his job three months ago hea new one but without luck.A. 1o

问题补充：

Since Jack was laid off from his job three months ago, hea new one, but without luck.

A. 1ooked for

B. had looked for

C. is looking for

D. has been loking for

答案：

A. 1ooked for

B. had looked for

C. is looking for

(答案→)D. has been loking for

解析：考查时态。since+含有过去时的句子，与完成时连用。根据句意可知，Jack被辞退后，一直在找新工作，但还没找到。找工作这个动作可能会继续下去，用完成时。故选D。