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

試題分析：句意：到目前為止，我們已經(jīng)學(xué)會了3000個英語單詞。結(jié)合語境可知本句描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時態(tài)。選B。
點評：英語中的時態(tài)主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結(jié)合語境來判斷句子的時態(tài)。
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