急,
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急,急, 急,Has...been （题目有错误
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.