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
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C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.