问题
May I know _______ your parents–Usually by phone, and sometimes by WeChat.
A:how do you keep in touch with
B:how often do you keep in touch with
C:how you keep in touch with
D:how often you keep in touch with;
B:how often do you keep in touch with
C:how you keep in touch with
D:how often you keep in touch with;
正确答案是：
