30.   It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo.

30.   It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo.

       A. are; have                  B. is; has                      C. is; have                    D. are; has

       It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo.

       A. are; have                  B. is; has                      C. is; have                    D. are; has

It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo．

A．are; have                 B．is; has                C．is; have               D．are; has

It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo.

　 A. are; have　　　　 B. is; has　　　　　 C. is; have　　　　 D. are; has