单项选择题

Directions:
There are ten short incomplete dialogues between two speakers, each followed by four choices marked A, B, C and D. Choose the answer that appropriately suits the conversational context and best completes the dialogue. Mark your answer on the ANSWER SHEET by drawing with a pencil a short bar across the corresponding letter in the brackets.
A: I’m sorry I’m calling you so late.
B: ______okay.

A.This is
B.You’re
C.That’s
D.I’m