.

Mary quickly closed the door of her room _______ her father could reach it to keep him out.

A．before

B．when

C．as

D．while

团体保险中每个员工的投保金额一般是（）确定的。

A.由被保险人（即团体中的员工）任意选择确定

B.由投保人（即团体）任意选择确定

C.由一个约定方法计算确定

D.由保险公司确定