15. Three quarters of the land here wet land an ideal place for migrating birds. A. are

问题补充：

15. Three quarters of the land here wet land, an ideal place for migrating birds.

A. are

B. is

C. have been

D. Being

答案：

A. are

(答案→)B. is

C. have been

D. Being

解析：可联系答.案.网客服索取。