A、  B、  C、  A使用or询问你和Mario到底谁联络谁，get in touch with~是“和…联络”的意思，I’m supposed to～“我应该…”的回答较适当。

(Man1)    I’d prefer to stay at the Capital Hotel during the conference, wouldn’t you?
(Man2)    (A) Yes, it was a very interesting conference.
(B) Yes, I prefer that hotel, too.
(C) No, it’s on the third floor of the hotel.

(Woman 1)Were you going to get in touch with Mario, or was he going to call you?
(Woman2) (A) I’m supposed to contact him.
(B)  It was Mario.
(C) We’re going there now.