今天的题。 ①As far as I know,--------their task ahead of the time,they often stayed up late into the night. A.finishing B.having finished C.finished D.to finish ②------- no clouds in the sky,it looks bluer than ever. A.There are B.There being C.For it being D.There having ③-------a fine day,Shenzhou Ⅷ will be launched on time according to its planned time. A.Being B.To be C.It being D,It is