Great changes ___ in my hometown since 1980.
问题描述:
Great changes ___ in my hometown since 1980.
答
Great changes have happened in my hometown since 1980.
答
have happened
答
Great changes _have taken place __ in my hometown since 1980.注意这里只能用take place(按计划必然发生) 不能用happen (偶然发生)