答案是正确的，因此老师不得不让男孩回家。
The answer is right, so the teacher have to let the boy go home.
答案是正确的，因此老师不得不让男孩回家。
The answer was right, so the teacher had to let the boy go home.
人们可以在世界各地学习很多东西而不让他们回家。
People can learn lots of things around the world without leaving their home.
人们可以在世界各地学习很多东西而不让他们回家。
People can learn lots of things around the world without leaving their home.
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