Peter worked so fast with the maths problems ____

She racked her brains trying to _____ the maths problem. A. work up B. work down

Peter worked so fast with the maths problems ______ a lot of mistakes.A．as to makeB．that m

This maths problem is easy ______________.A.work outB.to be working outC.workedD.to wor

Peter worked so fast with the maths problems ____

This maths problem is easy ______________.A.work outB.to be working outC.workedD.to wor

The harder I tried ______it seemed to solve that math problem.A.the impossibleB.most impo