题目

    It’s hard to talk to dad sometimes. His silence about his feelings and thoughts made him mysterious and hard to see through. You could never break his hard shell and get to know him, And he seemed to want to stay that way too.     But a year ago when my relationship with my wife and career took a hit, I needed my dad to pull back the curtain so I could see him as real and accessible. I was facing serious problems and I wanted to know whether he had faced them before and how he had found his way, because I felt like I had lost mine. In desperation, it occurred to me that sen 如下图是一块带有圆形空洞和正方形空洞(圆面直径与正方形边长相等)的小木板，则下列物体中既可以堵住圆形空洞，又可以堵住方形空洞的可能是 [　　] A． B． C． D．