Software design is a(71)process .It requires a certain(72)of flair on the part of the designer. Design can not be learned from a

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问题 Software design is a(71)process .It requires a certain(72)of flair on the part of the designer. Design can not be learned from a book .It must be practiced and learnt by experience and study of existing systems .A well(73)software system is straightforward to implement and maintain ,easily(74)and reliable .Badly(73)software systems ,although they may work are(75)to be expensive to maintain ,difficult to test and unreliable.

选项 A、understand
B、understands
C、understanding
D、understood

答案D

解析
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