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

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Ifound___noteasytoworkouttheproblem,A.thisB.thatC.itwasD.it''sIfound___noteasytoworkouttheproblem,A.t

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

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

C

C.it was