问题
Computers_______ many things and we_______ these modern machines.
A:are used to doing; are used to use
B:are used to do; are used to using
C:used to do; are used to using
D:are used to do; used to use;
B:are used to do; are used to using
C:used to do; are used to using
D:are used to do; used to use;
正确答案是：
