I found ___ not easy to work out the problem,A.thisB.thatC.it wasD.it's

来源：学生作业学帮网 编辑：学帮网 时间：2024/06/11 00:41:42

I found ___ not easy to work out the problem,
A.thisB.thatC.it wasD.it's

C.it was

C

C.it was