1A thermos is used ( ) keeping hot.AofBinCoffDdown 2They had

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1A thermos is used ( ) keeping hot.AofBinCoffDdown 2They had learn one thousand English words...
1A thermos is used ( ) keeping hot.AofBinCoffDdown 2They had learn one thousand English words ( ) the end of last term.AatBinCbyDon第1题选择并说明理由；第2题选C,为什么不选A,两者的区别?
第一题答案是C，是它有误吗？

1.选C.但是Off（介词）不是跟used搭配的.
你可以查询off的意思.就是热水瓶是用来隔开（外界的温度）进行保温.
2.C by是表示到上个学期末为止（一段时间）.at只是表示在期末时（一个点不表一段时间）.

1A thermos is used ( ) keeping hot.AofBinCoffDdown 2They had a thermos is used for water hot The jacket us warm A used to keeping B is used to keeping C 求英语提解答( )50 The pot ___ for ___ hot water.A.used; keeping B. 3.A coat can_____ for keeping warm.A.be used B.is used C.bee 1,they tell us something[ ]keeping kit 2,she is good[ ]math The pot was used for keeping hot water为什么用was （）_____they had when they swam in the river in hot summer!A ＿＿＿at the hotel ,they had a hot bath . My parents used -----they had to get a new car for me . My parents used ___ they had get a new car for me(Awhich Bth My parents used 空格 they had to get a new cr for me.