Mrs.Wang caught her youngest son ___a website that wasn't very appropriate for children. 答案是browsing 為甚麼不是browse呢d?

S + catch + O + Ving 是
感官動詞中受詞主動用法。
Mrs.Wang caught her youngest son ___ a website.
在這句話中，browse a website 是現在分詞片語當受詞補語，表示主動，因此應該要+ing => browsing.
以下再舉一個例子：
I found her ___(weep) in the room.
同上述，此處的空格應該填入weeping。