问题补充：
Space exploration has been made with the development of modern science and technology.
A. it possible
B. it was possible
C. that possible
D. possible
答案：
A. it possible
B. it was possible
(答案→)C. that possible
D. possible
解析：该句测试是make sb./ sth.+adj. 结构，如果用A项，后应用to do sth.，因为it是形式宾语，代替不定式。
With the development of modern science and technology, man has made space exploration possible.
