tens of thousand of chinese middle school students have to foreign countries to study翻译成汉语

这句话不完整吧，have to中间少了个动词？been？
句子的意思应该是： 成千上万中国的中学生去外国读书。

数以万计的中国中学生都不得不去国外学习

high school students who often goes to have a class of time as long as teachers usually like good students

数以万计的中国学生不得不到国外学习。

这句子有点不通,have to 后面应该是went to,这样翻译就是数以万计的中国中学生不得不去外国学习.