Since1949,thepeople’slivingstandard  

问题详情：

Since 1949, the people’s living standard  ____ , causing a big ____ in population.

     A. has been raised; rise                        B. has been risen; raise

     C. has raised; rise                              D. has raised; rose

【回答】

A

知识点：现在完成时及其被动式

题型：选择题