单选题 Plastic heart valves and other human "spare parts" have ______ possible many recent developments in surgery.

A、 made it
B、 been made
C、 made
D、 become

【正确答案】 C

【答案解析】[解析] make后面可以跟带形容词的复合结构(make sth. possible)，如果宾语太长，也可把形容词提到宾语前面；如果宾语是不定式或从句，则需将宾语后移，用形式宾语填补，如：make it possible to do sth.；make it possible that…；make possible+(较长)宾语。