— I have got a backache.— That’s not surprising. You in front of that computer too long.A

问题补充：

— I have got a backache.

— That’s not surprising. You in front of that computer too long.

A. work

B. worked

C. have been working

D. are working

答案：

A. work

B. worked

(答案→)C. have been working

D. are working

解析：考查时态。句意：—我后背疼。—这不令人奇怪。你在电脑前面工作的时间太长了。根据句意可知你在过去一直时间一直都坐在电脑前面，对现在产生的影响就是你的后背疼痛，故使用现在完成时或者现在完成进行时。故C正确。