By the year 2012,the world's population__seven billion,A may be B_英语解答

By the year 2012,the world's population__seven billion,A may be B maybe C may is D may,

人气：105 ℃　时间：2020-04-16 09:34:39

解答

A may be
这句话缺少谓语动词,所以用情态动词+动词原形做谓语.
B只是副词 C is不是原形 D.缺少动词原形