Question

______ for something, a receipt is given to you. A．Paying B．Having paid C．When you have

______ for something, a receipt is given to you. A．Paying B．Having paid C．When you have paid D．To be paying

Answer 1

C

考查非谓语动词。pay和give有先后关系，应该用完成时；排除A、D；B项缺少逻辑主语，故排除；C项符合题意。故选C。