We had learned about 1,500 words________last term．A.by the end ofB.to the end ofC.in the end ofD.at the end
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A解析分析：by the end of last term(到上学期底为止)，by+过去时间，句中的谓语动词要用过去完成时。(延伸)1)by the end of+时间(到……时间的底为止)，该时间是过去时问，句中动词谓语要用过去完成时。2)at the end of+时间/地点：He will arrive in Shanghai at the end of this month．(他将在本月底到上海)at the end of后面如果是过去时间，往往句中谓语用一般过去时，如：He arrived in Shanghai at the end of last month．(他在上月底到上海)He lives at the end of this street．(他住在这条街的尽头处)3)in the end(最终)，相当于finally/at last．in the end后面不会接of．4)to the end：Go to the end of this road and turn left．(走到这条路的尽头，然后左拐弯)5)the beginning of last month(上月初)，the middle of last month(上月中)，the end of last month(上月底)