Question

英语选择题，需要详细解释.谢谢

I was shown into the waiting-room ______,as I had expected,was full. A.that B.which C.who D./

Answer 1

本人认为选B.定语从句代指the
waiting-room，排除C.在从句中作was
full的主语，不能省略，排除D.至于选项A和B.我没有合适的理由，如果在横线前有个逗号更好点。