问题补充：
of last term we over two thousand new words.
A. At the end; had learned
B. In the end; learned
C. By the end; have learned
D. By the end; had learned
答案：
A. At the end; had learned
B. In the end; learned
C. By the end; have learned
(答案→)D. By the end; had learned
解析：
这题的第一空填by the end of“到…结束为止”，后面接的是last week“过去时间”，所以句子用过去完成时，句意是：到上学期末为止，我们已经学习了2000多个生词。选D。
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