题目内容

I have spent the whole morning __________(try) to solve the problem.

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We'll __________(broadcast) this show at 9 pm sharp.

How you __________(decide) to finish this relationship is another matter.

He bought a house __________ (build) 3 years ago.

物联网从下之上依次可以划分为哪些层次？各层次的功能是什么？