Thank you for letting me _________________ your dog for a walk.
D
Correct answer
Explanation
The correct answer is 'take'. After the verb 'let' in the structure 'let + object + bare infinitive', we use the base form of the verb without 'to'. 'Thank you for letting me take your dog for a walk' follows this pattern correctly. 'Let' is a causative verb that requires the bare infinitive (verb without 'to'). Option A 'taking' would be used with 'allow' or 'permit', not 'let'. Options B and C ('have' and 'having') don't fit grammatically in this structure.