问题
选择题
By the end of last year, we _________seven hundred English words.
A． learned
B．have learned
C．had learned
D． would have learned
答案
答案：C
考察时态，by是完成时的标志，by后面跟什么时间，主句就用什么完成时，根据last year过去时间可知，主句应该用过去完成时
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