英语填词1.They captured the fish and cooked the food over an ope
英语填词
1.They captured the fish and cooked the food over an open fire___(start)with a magnifying glass.为什么不可以填starting而是填started?
2.This is not the first time scientists___(try)to solve the problem.But the methods they tried in the past were failed.为什么填have tried,有什么固定用法吗?