你这划线部分在哪啊?要是画的He,就是who studies by doing a lot of exercises for a text?
如果是 doing a lot of exercises 就是By what does he study for a test?
如果是for a test就是Why does he study by doing a lot of exercises?
你这划线部分在哪啊?要是画的He,就是who studies by doing a lot of exercises for a text?
如果是 doing a lot of exercises 就是By what does he study for a test?
如果是for a test就是Why does he study by doing a lot of exercises?