We could not have fulfilled the task in time if it ______ fo

We could not have fulfilled the task in time if it ______ for their help
A.was not B.is not C.has not been D.hasn't been
The hotel______during the vocation was rather poorly managed.
A.as i stayed B.where i stayed C.which i stayed D.what i stayed
呵,把题目打错了,第一个选择题目的的选项C应当是had not been D项是has not been 是不一样的选项.