单项选择题

Section A Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.

A.On or before November 13.
B.Not before November 13.
C.On or be fore November 30.
D.Not before November 30.