After Tom had finished some paper work, he ______ interviewing the applicants.
A．starts
B．had started
C．started
D．has started
C
题目分析：句意：在汤姆完成一些文件工作后，他开始面试一些申请人。因为是先完成工作再面试，由前面的had finished，可知interview是过去发生的，用一般过去式，选C。
| Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need. | |
has gone into developing intelligent materials, this may not be as 1_____ as it sounds. Self-cleaning clothes have now been created, and these new materials provide 2_____ resistance to dirt as well as water. As a result, they require much less cleaning than traditional materials. The creation of self-cleaning clothes provides an example of how nature helps scientists develop better products. This self-cleaning nature is known as the "lotus effect". The name comes, of course, from the lotus leaves, which are famous for growing in muddy lakes and rivers while remaining almost 3_____ clean. By observing nature, scientists are 4_____ the qualities of the lotus leaves to the materials they have engineered. Because of this, some remarkable new products have been 5_____. Among them are special windows that are resistant to dirt and water. A special 6_____ on these windows not only prevents dirt from sticking to their surfaces, but also allows dust to be easily washed off by the rain. In fact, these new windows have already been 7_____ to some cars. Even when traveling at high speed through rain, these cars never have to use their windshield wipers (雨刮器). Although we have already seen some practical applications, even more dramatic 8_____ will be made in the future, and they will, perhaps, change our world completely. Undoubtedly, technology is an important development, and it will have an even bigger 9_____ on our lives. |