She told me that the number of students to be admitted ____at that time.
A、had not been decided on
B、were not decided on
C、has not been decided on
D、are not decided on
【正确答案】：A
【题目解析】：考查过去完成时。两个动作都发生在过去，先发生的用过去完成时，后发生的用一般过去时；因此decide 需要用过去完成时，人数是被确定的；因此decide 与 number 为被动关系，要使用 be done的形式，A 符合题意。
