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  3. The home computers industry has been growing【21】in the world for the last twenty years. Computers used to be large, expensive ma

The home computers industry has been growing【21】in the world for the last twenty years. Computers used to be large, expensive ma

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问题     The home computers industry has been growing【21】in the world for the last twenty years. Computers used to be large, expensive machines that【22】very difficult to use. But scientists and technicians have been making smaller and cheaper while at the same time they have been made easier to use. As【23】, their popularity has been increasing as more people have been buying computers for their homes and businesses.
    Computers have been designed to store【24】and compute complex problems. Computers are used in【25】traffic in some cities. Stores use computers to keep records of their goods and to send【26】to their customers. Offices use computers to type letters, record business and communicate【27】other offices. People have been using computers in their homes to keep track of expenses and【28】their household appliances on and off.
    One important new【29】for computers is for entertainment. Many new games which have been designed to be played on the computers have become very popular【30】.
选项 A、control
B、controlling
C、controlled
D、to control
答案B
解析 本句的意思是：在一些城市，计算机可用来控制交通。按照语法规则，介词后面的动词要变成动名词形式，所以选择B项为正确答案。
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