Sentence: ... for having us you must come to us next time

[Derik]

Business Idiom in English, Intermediate level

ESL/EFL Test #130 "Way of saying goodbye", question 5

Thank you so much for ......... us you must come to us next time.

(a) taking
(b) getting
(c) making
(d) having

Business Idiom in English, Intermediate level

ESL/EFL Test #130 "Way of saying goodbye", answer 5

Thank you so much for having us you must come to us next time.

Correct answer: (d) having
_________________________

I don't get the meaning of the sentence.

thank you so much

Derik

[Conchita]

These are two sentences, really:

Thank you so much for having us, which means thank you for your hospitality, thank you for welcoming/receiving/entertaining us.

You must come to us next time is a way of returning the invitation and means now it’s your turn to come to our house.

[Ofriendragon]

Thank you so much for having us you must come to us next time.

Would you please tell me usage of MUST here? Will the listener feel sth. like OUGHT TO/SHOULD?

Thanks

[Conchita]