Software design is a(46) process. It requires a certain amount of fl air on the part of the(47). Design can not be learned from 

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问题 Software design is a(46) process. It requires a certain amount of fl air on the part of the(47). Design can not be learned from a book . It must be practiced and learnt by experience and study of existing systems. A well(48) software system is straightforward to implement and maintain , easily(49) and reliable. Badly(48) software systems, although they may work are(50) to be expensive to maintain , difficult to test and unreliable.

选项 A、maintain
B、maintains
C、maintaining
D、maintained

答案A

解析
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