______years ago ,very large animals called dinosaurs _______
______years ago ,very large animals called dinosaurs _______lived in sone areas of the world. A.Many millio;have been living B.Million;had lived C.Several millions of;are alive D.Millions of;lived
选d.第一空,用x million years或者x millions of years,所以排除B,A选项你没写全,如果是Many million或者Many millions of就是对的,其他的就是错的.第二空,时间为______years ago :x年之前,为过去时间,所以用一般过去时lived,所以选d