根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
Mrs. Lee: Hello. 68178502.
David: Hello.____ ?
Mrs. Lee: Sorry.____ . Can I take a message?
David: Yes. This is David, Bruce’s friend. I want to ask him for some Chinese ancient coins. He told me he had got some recently. ____ . I don’t care if they were made of different metals. I just want to add some more coins in my collection.
Mrs. Lee: OK. I’ll tell him. Would you like him to ring you back later?
David: Well, I won’t be at home later this day. Would you please ask him to ring me tomorrow morning?
Mrs. Lee: Sure.____ ?
David: Oh, sorry.____ The new number is 66129853.
Mrs. Lee: OK. I’ll write a message for him.
David: It’s really nice of you, Madam. Thank you very much. Goodbye!
Mrs. Lee: Bye!
A. He’s not in at the moment.
B. Who are you?
C. My telephone number has changed.
D. I’m not sure he would give me one or two.
E. Could I speak to Bruce, please?
F.I am very happy to hear that.
G. Has he got your telephone number? |
双链在复制时解旋，这时下列哪一对碱基从氢键连接处分开