Question

---I have got a headache．
----No wonder ．You _______in front of that computer too long ．

A．work

B．are working

C．have been working

D．worked

Answer 1

C

考察时态。句意：我头疼。——不足为奇。你在电脑前工作的太久了。可知叙述的是已经完成的一直在进行的动作，故用完成进行时，选C。