locks had not been forced,___that the burglars... A.which pr

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locks had not been forced,___that the burglars... A.which proved B.by this proving. 为什么不选b.

B选项,是一个新句子的开始,并且要作为条件状语,也就是说,在By this proving後面,要继续说.
A选项,是定语从句,既保持意思的准确,又在语法上,令句子完整.
再问： .by this proving.是一个新的条件句？能不能把它理解成：通过这证明了什么什么，为什么
再答：当然可以用By this proving，但是，你要开展一个新句子。所以，保持语义的同时，这个句子有两个说法： 1. Locks had not been forced, which proved that the burglars... 2. Locks had not been forced. By this proving, the burglars... 所以说，选择B的话与题中的句型不符了
再问：为什么要开始一个新的句子，用by
再答：因为题中， Locks had not been forced. 这句话的成份已经完整了，所以只能再添加定语从句，也就是以which 开头的。 By 。引导的条件状语从句，是作为开头的，必须把话说完整才可以。

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