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最佳答案：have to
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最佳答案：为你解答.最后,他不得不步行回家.Finally, he had to walk home.
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最佳答案：I can't help not to practice piano.
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最佳答案：ut i have to get up early
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最佳答案：Mike has to take care of his sick mothe
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最佳答案：Sometimes,her dad has to go to some English-speaking countries.
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最佳答案：Jacky Chen has to work hard
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最佳答案：He had to raise his children alone
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最佳答案：I am obliged to help my father to wash his car.
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最佳答案：Now the Earth is having to face the threat of global climate