we have learned about 2000 English wordsA. At first B. After allC. So far

问题补充：

we have learned about 2000 English words.

A. At first B. After allC. So far

答案：

解析：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。

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