no doubt that a green campus plays an important role in the growth of students, both physically and mentally.
A. It is
B. There has
C. There is
D. It has
网友回答
A. It is
B. There has
(答案→)C. There is
D. It has
解析：考查固定句型：There is no doubt that…“毫无疑问…”，that引导的是同位语从句，句意：毫无疑问绿色校园在学生的身体和精神成长方面起着重要的作用。选C。