下列关于文学常识的叙述正确的一项是（ ）

Ann is in hospital.— Oh, really? I _____ knowI _____ go and visit her.

. It was not until Maggie had arrived at her office _____ her appointment with the doctor.

He said he _________ his work, and then we needed to wait for him for a little while

for your timely warning, we _____ into greattrouble— Well, you know we’re friends