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  3. More and more residences, businesses, and even government agencies are using telephone answering machines to take messages or gi

More and more residences, businesses, and even government agencies are using telephone answering machines to take messages or gi

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问题     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 (1)_____ instructions, or play messages that are difficult to understand. If you (2)_____ telephone calls, you need to be ready to respond when you get a (3)_____
    The most common machine is the (4)_____ used in residence. If you call a home (5)_____ there is a telephone answering machine (6)_____ you will hear several rings and then a recorded message that (7)_____ says something like this: "Hello. We can’t come to the (8)_____ 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", (9)_____ is a brief, high-pitched (10)_____. After the beep, you can say who you are, whom you want to speak to, and what number the person should call to (11)_____ you, or you can leave a (12)_____. Some telephone answering machines record for only 20 or 30 seconds after the beep, (13)_____ you must respond quickly.
    Some large businesses and government agencies are using telephone answering machines to provide information on (14)_____ about which they receive a large volume of (15)_____. Generally speaking, using these systems (16)_____ you to have a touch-tone phone (a phone with buttons rather than a rotary dial). The voice on the machine will tell you to (17)_____ a certain button on your telephone if you want information on Topic A, another button for Topic B, and so on. You listen (18)_____ you hear the topic you want to learn about, and then you push the (19)_____ button. Immediately after making your (20)_____, you will hear a recorded message on the topic.

选项 A、that
B、who
C、what
D、which
答案D
解析 结构衔接题。从句中的beep(嘟嘟声)、brief(短暂的)和high-pitched(声音尖锐的)可以看出，这里是对beep的解释。句中需要一个引导定语从句的关系代词，在句中作主语。根据语法规则可知，作定语从句中主语的关系代词可为which或that，但该句中beep后由于有逗号分隔，为非限制性定语从句，因此只能选which。that不能引导非限制性定语从句；who引导先行词为人的定语从句；what不能引导定语从句，只能引导主语从句、宾语从句和表语从句。
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