省略：
1)省略是为了避免重复，保持语言简洁的一种语法手段。尤其是在口语中，省略是个普遍现象，例如：
I have heard of the news. So have I.
He didnt go to the concert yesterday. Neither did I.
想一下，为什么以上句子的应答部分要采用倒装形式?此外，此类省略形式的要注意的一个问题是：前后时态要一致。
2)就职称考试而言，大家要特别注意由when, while, whether, if, unless, although等引出的状语从句中的省略现象，比较：
不省略：The young boy was badly injured by a motorcycle when he was crossing the street.
省略：The young boy was badly injured by a motorcycle when crossing the street.
不省略：If irrigation is not well managed, it can be harmful.
省略：If not well managed, irrigation may be harmful.
从以上两个例子可以归纳出此类从句的省略基本规则：
只有当主句和从句的主语相同时才能采用省略形式，省略时将从句的主语连同be动词一起省略;
如果句子主语与从句的动词是主动关系，采用-ing形式;如果句子主语与从句的动词是被动关系，采用-ed形式;
根据以上规则，确定以下题目的正确答案：
If ______ a hot bath before sleep, a days tiredness will soon vanish.
A.taking
B.taken
C.to take
D.you take