问题补充：
The experiment to be .
A. turned out; greatly success
B. turned out; a great success
C. turned out; greatly successful
D. turned up; great success
答案：
A. turned out; greatly success
(答案→)B. turned out; a great success
C. turned out; greatly successful
D. turned up; great success
解析：考查固定短语和名词的数。句意“那次实验结果证明是一个很大的成功。”turn out to be/as...“结果证明是......”；success是不可数名词，当指“成功的人或事”时，是可数名词。故选B。
