By the end of last year, we _________seven hundred English words.
A． learnedB．have learnedC．had learnedD． would have learned
C
考察時(shí)態(tài)，by是完成時(shí)的標(biāo)志，by后面跟什么時(shí)間，主句就用什么完成時(shí)，根據(jù)last year過(guò)去時(shí)間可知，主句應(yīng)該用過(guò)去完成時(shí)
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