【题目】If ________ for an explanation for an advanced camera, I would certainly find it difficult.
A.to be asked
B.being asked
C.asking
D.asked

【答案】D
【解析】句意：如果我被问到对于高级相机的解释时，我发现这很困难。两个句子共用一个主语I，和动词ask是被动关系，相当于if I was asked for an explanation for an advanced camera, I would certainly find it difficult.，所以答案是D。