Firms that use computers have found that the number of staff _____ is needed for
题型：不详难度：来源：
| Firms that use computers have found that the number of staff _____ is needed for quality control can be greatly reduced. |
答案
| D |
解析
试题分析：通过分析句子结构，可知这个句子中包含一个定语从句。that在定语从句中作主语，故用that。
点评： 限定性定语从句，that即可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，which在从句中作宾语则不能省略。而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前边，但有的则放在它原来的位置 |
举一反三
| Any habit ______ slows down your silent reading to the speed at which you speak, or read aloud, is inefficient. |
My laptop computer, _______ I can’t go on with my work, broke down the other day.| A．for which | B．which | C．without it | D．without which |
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| He had collected plenty of historical evidence, proved that humans used to have different sleeping patterns. |
Experts believe that language learning is a process ______ skills are more important than grammar rules.| A．whose | B．when | C．of which | D．in which |
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I shall never forget those years _______ I lived in the country with the farmers, ______ has a great effect on my life.| A．that; which | B．when; which | | C．which; that | D．when; who |
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