I was completely terrified when I suddenly saw a dark figure leaning the door in front of

问题补充：

I was completely terrified when I suddenly saw a dark figure leaning the door in front of me.

A. in

B. to

C. against

D. by

答案：

A. in

B. to

(答案→)C. against

D. by

解析：C句意：我突然看见一个黑影靠在我前面的门上时，我完全被吓呆了。lean against意为“靠在”。