[单项选择]（） some of the tasks done by man before, computers are sometimes called thinking machines.
A. Taking over
B. To have taken over
C. To take over
D. To be taken over

Before the widespread use of computers, managers could not make full use of large amounts of valuable information about a company’s activities. The information either reached managers too late or was too expensive to be used. Today, managers are facing a wide range of data processing (数据处理) and information instruments. In place of a few financial controls, managers can draw on computer-based information systems to control activities in every area of their company. On any kind of performance measures, the information provided by these systems helps managers compare standards with actual results, find out problems, and take action before it is too late to make changes.
The introduction of computerized information system has sharply changed management control in many companies. Even a neighborhood shopkeeper may now use computers to control sales, billing, and other activities. In large companies, electronic data processing systems monitor entire projects and s
A. They couldn't made full use of the valuable information about a company's activities.
B. They .had to spend a lot of money getting the information.
C. The information didn't reach them.
D. They are facing a wide range of data processing and information instruments.