I have been studying computer for years and I still .A. haveB. doC. have beenD. am

问题补充：

I have been studying computer for years and I still .

A. have

B. do

C. have been

D. am

答案：

A. have

B. do

C. have been

(答案→)D. am

解析：句意：我这么多年一直在学习电脑，并且现在还在学习。And前面的句子用现在完成进行时，表示动作从过去到现在一直在做，而且还可能继续下去，所以用现在进行时，这句话是省略句，完整的是I am still studying it，所以保留be动词，选D。