作业帮急,
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急,
急,
急,
Has ...been （题目有错误,原题应为：Tom has been .）
They felt too tired to walk so fast
1.Has,been
2.They felt so tired that they couldn't walk so fast.
Have had
1有问题，需把have---has
Has ....been
2. They felt so tired that they couldn't walk fast./ They felt too tired to walk fast.