2. 外语
  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 in formation or instructions. Sometimes these machines give 【C1】______ instructions, or play messages that are difficult to understand. If you 【C2】______ telephone calls, you need to be ready to respond when you get a 【C3】______ The most common machine is the 【C4】______ used in residence. If you call a home 【C5】______ there is a telephone answering machine 【C6】______ you will hear several rings  and  then  a  recorded message that 【C7】______ says something like this: "Hello. We can’t come to the 【C8】______ 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," 【C9】______ is a brief, high-pitched 【C10】______ . After the beep, you can say who you are, whom you want to speak to, and what number the person should call to 【C11】______ you, or you can leave a 【C12】______ . Some telephone answering machines record for only 20 or 30 seconds after the beep, 【C13】______ you must respond quickly. Some large businesses and government agencies are using telephone answering machines to provide information on 【C14】______ about which they receive a large volume of 【C15】______ Generally speaking, using these systems 【C16】______ you to have a touch-tone phone. The voice on the machine will tell you to 【C17】______ a certain button on your telephone if you want information on Topic A, another button for Topic Band and so on. You listen 【C18】______ you hear the topic you want to learn about, and then you push the 【C19】______ button. Immediately after making your 【C20】______ , you will hear a recorded message on the topic.
【C9】
选项 A、that
B、who
C、what
D、which
答案D
解析 结构衔接题。句中需要一个引导定语从句的关系代词，在句中作主语。可以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，因此正确选项是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、表语从句。
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