问题：

[单选题]There is no single technology system or tool that is perfect in all aspects; _______, people should avoid an unreasonable expectation that any good system or tool should be able to do everything.DPi答案窝(daanwo.com)-大学作业答案分享平台
AthereforeDPi答案窝(daanwo.com)-大学作业答案分享平台
BbutDPi答案窝(daanwo.com)-大学作业答案分享平台
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