Only when the work was finished _______ back home.

Only when the work was finished _______ back home.
A.did the workers go B.the workers went
C.went the workers D.the works did go

1.答案：A.
2.
1）此题考查部分倒装的语法.
2）英语语法相关规定如下：
如果only修饰句子的状语/状语从句,并被提前至句首时,则该句/主句必须采用部分倒装.其变化形式类似于变一般疑问句,即把相应的be动词/助动词/情态动词也提前.
3）该题恰好是把only修饰的时间状语从句提前,符合部分倒装条件.
其状语从句句序不变,主句采用部分倒装：把助动词did提前,然后后面采用动词原形go.
4）至于为什么选用did提前,想必我不用多解释了：主句谓语动词went是行为动词,所以借助于did进行变化.
主句的一般疑问句为：did the workers go back home
3.综上所述,正确答案为A.