We _____ more than 1,600 words since we began to learn English.
A．learnB．have learned
C．learnedD．a(chǎn)re learning
B

試題分析：句意：自從我們開始學(xué)英語我們已經(jīng)學(xué)了1600多個單詞了�，F(xiàn)在完成時表示過去某一時間開始并一直持續(xù)到現(xiàn)在并且有可能還會持續(xù)的動作或狀態(tài)。結(jié)合句意，故選B
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