You don’t know about the difficulty I had______the work then at all.A、doneB、to

游客2025-03-15 18

问题 You don’t know about the difficulty I had______the work then at all.

选项 A、done
B、to do
C、for doing
D、in doing

答案 D

解析

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(Eversince)theworld(began),nations(havedifficulty)(inkeeping)peacewit