Although it is midnight now,my father is still A.in work B.in the work C.at work D.at the work

题目

Although it is midnight now,my father is still A.in work B.in the work C.at work D.at the work
应该选哪个?为什么?
第二题 完成句子
他们过去吸烟很凶,但是现在不吸了.
They a lot,but now they give it up 一个问号代表一个单词

答案

C
at work 习语“ 在工作” 与语境相符
“尽管现在已是午夜,可我父亲还在工作”
used to smoke
used to do sth 过去常常.（含有“现在已经不了”之意,侧重与现在的对比）