Question

【题目】They had planted 10,000 treesof last month.
A.in the end
B.to the end
C.at the end
D.by the end

Answer 1

【答案】D
【解析】句意：他们到上个月底为止已经中了一万棵树。by the end of到……时为止，是完成时态的标志。in the end最后，等于at last；at the end of在……末端；在……尽头。故选D。