【题目】 The man was so surprised at _______ that he did not try to escape or defend himself.
A.discoveredB.discoveringC.to be discoveredD.being discovered
在线课程【答案】D
【解析】
考查动名词一般式的被动式作宾语。句意：这名男子被发现后非常吃惊，他没有试图逃跑或自卫。介词at后面是动名词作宾语，且句子主语The man和discover之间是被动关系，是动名词一般式的被动式作宾语。故选D。