来自邵发森的问题
Wehavefinishedtheprojectfinally.Noonecanimaginethedifficultywehad_____theproblem.AtosolveBsolvedCsolvingDsolve
Wehavefinishedtheprojectfinally.Noonecanimaginethedifficultywehad_____theproblem.A
tosolve
B
solved
C
solving
D
solve

