I spend time as much as I could _____ the math problem.A.work outB.to work outC.working outD.to work on

分类: 作业答案 • 2022-04-13 21:54:36

问题描述：

I spend time as much as I could _____ the math problem.
A.work out
B.to work out
C.working out
D.to work on

答