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This math problem is___that one

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This math problem is___that one
A .so easy as B.as difficult as C.much difficult than D.less easier
This math problem is___that one
B
as……as…… 和……一样
再问: 为什么不是A或D(D后少了than)
再答: A选项不能,除非前面是否定句,这个搭配的结构是not so...as, 就是说,以下说法是正确的:
This problem is as difficult as that one
This problem is not so easy as that one.

而D选项的easier 已经是比较级,不能加less