21. — Jay Chou is in our city. Let’s go and watch his show this Saturday.
— That’s great, but I need to call my dad and ask for before I go out.
A. permission
B. protection
C. invitation
D. Explanation
网友回答
A. permission
B. protection
(答案→)C. invitation
D. Explanation
解析：可联系答.案.网客服索取。