Question

_______ we have learned about 2000 English words.
A. At first         B. After all         C. So far

Answer 1

C

At first起初，开始；After all毕竟，终究；So far到目前为止，经常和现在完成时态连用。句意：到目前为止，我们已经学了大约2000英语单词。选C。