----Hello，Jane，have you arrived at the hotel?
-----Yeah，busy .I’ll call back later.
A. checking in
B. to check in
C. checking out
D. to check out
网友回答
(答案→)A. checking in
B. to check in
C. checking out
D. to check out
解析：考查固定搭配。本题考查了两个固定搭配check in登记入住；check out结账离开；be busy doing sth忙于做某事；句意：—Jane你好。你到宾馆了吗？—是的，我正在忙着登记入住，晚些时候给你电话。根据句意说明A正确。