【单选题】
{{B}}Directions:{{/B}}
Read the following text.Choose the best word(s) for each numbered blank and markA,B,C、orD、onANSWER SHEET 1.
More and more residences, businesses, and even government agencies are using telephone answering machines to take messages or give information or instructions. Sometimes these machines give{{U}} (1) {{/U}}instructions, or play messages that are difficult to understanD、If you{{U}} (2) {{/U}}telephone calls, you need to be ready to respond if you get a{{U}} (3) {{/U}}. The most common machine is the{{U}} (4) {{/U}}used in residence. If you call a home{{U}} (5) {{/U}}there is a telephone answering machine in operation you{{U}} (6) {{/U}}hear several rings and then a recorded message{{U}} (7) {{/U}}usually says something{{U}} (8) {{/U}}this: "Hello. We can’t come to the{{U}} (9) {{/U}}right now. If you want us to call you back, please leave your name and number after the beep." Then you will hear a "beep,"{{U}} (10) {{/U}}is a brief, high-pitched{{U}} (11) {{/U}}.Alter the beep, you can say who you are, whom you want to speak to, and what number the person should call to{{U}} (12) {{/U}}you, or you can leave a{{U}} (13) {{/U}}. Some telephone answering machines{{U}} (14) {{/U}}for only 20 or 30 seconds after the beep, so you must respond quickly. Some large businesses and government agencies are using telephone answering machines to provide information on{{U}} (15) {{/U}}about which they receive a large volume of{{U}} (16) {{/U}}. Using these systems{{U}} (17) {{/U}}you to have a touch-tone phone (a phone with buttons rather than a rotary dial). The voice on the machine will tell your to push a certain button on your telephone if you want in-formation on TopicA, another button for TopicB, and so on. You listen{{U}} (18) {{/U}}you hear the topic you want to learn about, and then you push the{{U}} (19) {{/U}}button.After making your{{U}} (20) {{/U}}, you will hear a recorded message on the topiC、
A．when
B．after
C．until
D．before
网考网参考答案：C
网考网解析：本句话的意思是说你在接听录音电话时，听到某个话题时，就该做某事，因此选择until表示一直听到……的意思。别的选项都不符合句意。
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