Part A You will hear 10 short dialogues. For each dialogue, there is one question and four possible answers. Choose the correct answer --A,B,C or D, and mark it in your test booklet. You will have 15 seconds to answer the question and you will hear each dialogue ONLY ONCE. What is the woman’ s reply
A．She knows Professor Arnold has come. B．She thinks Professor Arnold has checked in. C．She is sure that Professor Arnold has arrived. D．She doesn’ t know whether Professor Arnold has arrived.