How long__tom__ (learn)chinese befor he came to china?完形填空.最

How long__tom__ (learn)chinese befor he came to china?完形填空.最 How long__tom__ (learn)chinese befor he came to china?完形填空, The twin sister______(learn)Chinese since they came to China how to learn Chinese how to learn Chinese? Since I came to China,I__________ (learn)a lot about Chinese Mike came to ask me for some advice on (how to learn Chinese 首字母填空he comes to china to l____ chinese. How to learn Ancient Chinese? I did't learn how to cook until I came here.对until I came he He came to China to study Chinese history.为什么用to study? Go to China to learn Chinese