certain that his invertion will lead to the development of production.A. That’sB. This is

问题补充：

certain that his invertion will lead to the development of production.

A. That’s

B. This is

C. It’s

D. What’s

答案：

A. That’s

B. This is

(答案→)C. It’s

D. What’s

解析：通过分析句子结构，可知这个句子中包含一个主语从句，且主语从句位于句末，只能用it作形式主语，故选C。