So far we 3000 English words.A. learnedB. have learnedC. studiedD. learn

问题补充：

So far, we 3000 English words.

A. learned

B. have learned

C. studied

D. learn

答案：

A. learned

(答案→)B. have learned

C. studied

D. learn

解析：句意：到目前为止，我们已经学会了3000个英语单词。结合语境可知本句描述的是现在已经完成的动作，故用现在完成时态。选B。