All those second - hand books are sold at _____ before

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All those second - hand books are sold at _____ before
A.twice as a lower price as B.as twice low price than
C.twice as low a price as D.twice lower price than
这道题应该选什么呢,好像没有一个符合倍数表达法的,其他的几个错误选项应该怎么改才正确呢,望英语考试赐教

选C 倍数+as+adj.+n+as+.
再问： D可不可以？
再答：少了一个冠词a

All those second - hand books are sold at _____ before 1.All the second-hand goods are sold at_____before those are your books ,_____? Those are my books 改成 _____ are those? ________ (those,all,both) things are difficult before they a there are where sweets,second-hand toys,books and goldfish a Those books are for______________. Are those books (your) Those books are for Are those ______ books that和whereIt is in the store _____ science books are sold.为啥 What are those?________(those)are books.