当你打电话，询问对方是谁时，你应该说：A.Who are you?B.Whose friend are you?C.Who is that?D.Who is this?
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C解析解析：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.