全员流动人口服务管理信息系统中，全人口查询模式有：（）

听力原文：W: Good morning. Complaints Department.M: Yes. I'd like to speak to Miss Wang.W: Excuse me, sir. We have a bad connection. Could you speak a little more slowly?M: I-want-to-speak-to-Miss-Wang.W: This is Miss Wang speaking. Can I help you?M: I'm afraid I have to make a serious complaint to you.W: What's the problem?M: I'm sorry to have to say this, but the electronic dictionary you changed for me the other day doesn't work properly, either. I'm really annoyed about it.W: Would you like me to have it changed again?M: Oh, no. I'm tired of it. I'm just calling to find out if I can bring it hack.W: Have you got a receipt?M: I should have one, but I can't find it. It's my fault. Maybe I threw it away right after I went out of the store.W: That's a bit complicated, then. If you don't have a receipt, you can't have your money back.M: But I did buy it from your store. What if I can't find the receipt?W: I'm afraid there isn't much we can do. Would you please have another look for it and contact us?M: I'll do that. Bye.(27)A．They are talking about some returned items.B．One is making a complaint to the other.C．They are having a chat.D．The man is speaking in a low voice. 点击查看答案

The problem______solved, the engineer returned to his own factory.A．has beenB．wasC．had beenD．having been

A.
A．has
B.was
C．had
C.having

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