C
解析:①打电话时常用:Hello. This is Tom here. May I speak to Bob, please?/I'd like to speak to Bob./Is that Bob?/Is Bob in?等等。
②接电话时常用:Yes, speaking./Who is calling?/Yes, this is Bob./Hold on. He(She)isn't here right now. Can I take a message for you?等等。
③要对方等待时常用:A moment, please./Don't hang up, please./Hang on(a moment), please./Would you wait a minute, please?/Hold he line. I'll see if he's in.等等。
④对方要找的人不在时常用:sorry, but he's out./Sorry, but he won't be back till afternoon.
⑤通知某人接电话时常用:A phone call for you, Bob./Your mother's on the phone. /Somebody's asking for you on the telephone./Someone watns you on the phone./You're wanted on the phone.