The government has done something to make it ____ 85 decibel

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The government has done something to make it ____ 85 decibel
A.more than B.less than C.at most D.at least
(1)此句补语成分是神马?
(2)less than 是神马用法
(3)less than少于与 at most 至多.在句意上虽有差别,在用在这里偶觉得都没有什么大问题.
(4)less than 能看成是形容词短语吗?因为虽然比较比象,却构不成比较结构
答：BC
less than 和more than 相对,用于数字之前,表示小于和大于,用数学符号来表达就是< 和>
at most 和at least 也相对,表示至多和至少,用数学符号表达就是=
make 可以跟复合宾语,宾补可以是形容词,也可以是名词,意为“使.怎么样”和"使.成为.”
如：to make our campus beautiful 和to make him our monitor
前者的形容词也可以用比较级如：to make our campus more beautiful
此题的it不知道确指什么,所以这两种用法的可能都存在.
从生活常识看,句意很有可能是政府采取了措施来降低噪音,所以排除AD
译：
B：政府已经采取措施使它（噪音）少于85分贝.(应理解为make it less (形容词比较级）+than-从句（比较状语从句,省略句）
C：政府已经采取措施使它（噪音的量?）最多85分贝.（make it +名词）,at most只不过是一个修鉓语.
再问：果然是高手,终于遇到懂偶滴人了,内牛满面5555555555.........补充问一句than后面的从句省略的部分是神马?
再答：答：其实than就是个连词，后跟的就是从句。因为常用省略，有时只剩下一个名词，所以有人将它认着是介词。又由于less , more经常跟它一起连用，后跟数字，所以人们忘记了它原先的连词引导比较状语从句的功能了。省略的部分就是与前面相同的部分。 The government has done something to make it less than 85 decibel . 这样的情况更是特殊。一般对It is less than 85 decibel.进行句子分析和复原。 It is less than 85 decibel is little. (这样的还原，看到的很不习惯，不是吗？）

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