The examination will begin at 10:30. Those who come late ____ to the examination room. [ ]

A. have not been admitted

B. don't admit

C. will not be admitted

D. didn't admit

试件取样的要求规定：每拌制（）盘且不超过（）的同配合比的混凝土，其取样不得少于一次；每一浇筑楼层同配合比的混凝土其取样不得少于（）次。