In 1620,about half of the USA___covered by forest A:are B:is C:were D:was 选几?

分类: 作业答案 • 2021-12-31 10:28:24

问题描述：

In 1620,about half of the USA___covered by forest A:are B:is C:were D:was 选几?
急答!

答

was