问题补充：
By the end of this year, we 2000 English words.
A. will learn
B. would learn
C. have learned
D. will have learned
答案：
A. will learn
B. would learn
C. have learned
(答案→)D. will have learned
解析： by the end of this year引导的短语，句子要用将来完成时态。
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