留学知识库
真的搞不懂，什么时候用过去完成时，什么时候用一般过去是，例如.......
By next year, he _______ in New York for five year
He was _______ the preparation of an international
We are interested in the weather because it _____
What is the train _______ to Birmingham?
She only knew that she went there _______, but for
1929-1933年，美国爆发了席卷世界的经济危机，其特点是什么？
It is likely that our team _______ the game.
