By the end of last term we (learn) ______ 5,000 English words.

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问题 By the end of last term we (learn) ______ 5,000 English words.

选项

答案had learned

解析 句子意为:到上学期期末为止,我们已经学厂5000个单词了。本题测试动词时态。by后接表示过去的时间,句子应用过去完成时态。
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