几道简单的英语单选题,请解析一下

几道简单的英语单选题,请解析一下
1._____ a fine day,we decided to go out for a picnic.
A.Having been B.Being C.WhatD.It being
2.There has not been a great response to the sale,______?
A.dose there B.hasn't it C.hasn't thereD.has there
3._____they reached the center of the city,they stopped the car at a bar.
A.A mile or so before B.For a mile or so after C.Further than a mile or so D.Before a mile or so when
4.The president of university as well as some other faculty members ____ a conference.
A.are planningB.have plannedC.is planningD.had planned
5.Having no money but ____ to know,he simply said he would go with dinner.
A.not to want anyone B.wanted no one C.not wanting anyoneD.to want no one
6.______ the case,there were no grounds to justify your complaints.
A.Being suchB.Such isC.It being suchD.Such being