Question

9. We four thousand new words by the end of last year.

   A. had learned   B. have learned

   C. learned   D. will have learned

Answer 1

9. A

9. A解析：by the end of后接表过去的 时间状语时，句子用过去完成时。句意： 到去年年底为止我们已学了四千个新 单词。