1.-Why are you in a hurry?
-( )my mother is ill,I have to take her to hospital.
A.For B.Since C.As D.Because
2.-Hello,you look tired today.
-Yes ,Ispent too late yesterdayevening.I( )my homework and forgot the time .
A.was doing B.has done C.have done
希望能给讲解一下.