He ________  go out with his parents, but now he ________ staying at home alone.

A．used to; is used to

B．is used to; used to

C．use to；is used to

D．used to; used to

人寿保险费制定的基本原则是( )。此基本原则既适用于纯保费的制定，也适用于营业保费的制定。

A．等价交换、收支对冲
B．差价交换、收支相等
C．收支相等
D．等价交换、收支相等