Thank you for persuading my mother the army.
A. let me join
B. letting me join
C. to let me join
D. to let me to join
网友回答
A. let me join
B. letting me join
(答案→)C. to let me join
D. to let me to join
解析：考查固定词组。固定词组：persuade sb to do sth说服某人做某事；let sb do sth让某人做某事；句意：谢谢你说服我的妈妈让我参军。故C正确。