thats because引导什么从句

　　Thats because the classes are free and open to any student anywhere.

　　这是因为这些课程对任何地方任何学生都是免费开放的。

　　Thats because were not aware of the advantages of having a positive attitude all the time.

　　会有这种想法，是因为我们还没有意识到一直保持乐观心态的好处。

　　Thats because, despite what you hear about success, it has very little to do with formal education.

　　这是因为，虽然你听过关于成功的种种说法，但成功很少和正规教育有关。

　　Thats because larger plants needed deeper roots, which stabilized river banks and forced rivers into narrower paths.

　　因为越大的植物需要扎根更深，这就使得它们需要巩固河岸，强迫河道变得更窄。

　　Tim patted down the last heap of earth then replied, Thats because hes inside your cat.

　　提姆轻拍着最后填上的那堆土，回答道：那是因为金鱼在你那只猫的肚子里。