of this term, we will have learnt 4 books.A. At the endB. By the endC. In the endD. At a

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A. At the end
(答案→)B. By the end
C. In the end
D. At an end
解析：本题的含义是到这一个学期末端，我们将已经学完了4本书，by the end of表示到……末端的意思，通常用于将来完成时，故本题选B。