The civil war broke out in Libya, to the instability of the international oil price．
A. to contribute
B. contributed
C. having contributed
D. contributing
网友回答
A. to contribute
B. contributed
C. having contributed
(答案→)D. contributing
解析：本题考查非谓语动词。contributing to the instability of the international oil price，现在分词在句中作结果状语。选D。