When I heard about the marriage of Andy Lau you could have knocked me down with a .A. st

问题补充：

When I heard about the marriage of Andy Lau, you could have knocked me down with a .

A. stone

B. hammer

C. feather

D. knife

答案：

A. stone

B. hammer

(答案→)C. feather

D. knife

解析：考查固定搭配。A石头；B锤子；C羽毛；D小刀；习惯用语knocked sb down with a feather大吃一惊；句意：当我听说Andy Lau结婚的消息的时候，你让我大吃一惊。故C正确。