问题
选择题
At present, computer knowledge has become ___________ requirement as the ability to read and write.
A．so basic a
B．so a basic
C．as basic a
D．as a basic
答案
答案：C
题目分析：句意，现在，对电脑知识的需求已经变得和对阅读和写作能力的需求一样基本了。在肯定句中只能用as...as.．．，排除A和B，as之后要直接接形容词，故排除D，故选C。
点评：在否定句中既可以用not as ...as...也可以用not so...as,而在肯定句中只能用as...as.．．