The actual mistake in choice D is the word "arrangement". "Arrangement" doesn't refer to the process of arranging something; it refers to the arrangement that results from that process.
(Similarly, "as I was judging xxxx" makes sense. "During my judgment of xxxxx" doesn't, because a judgment is a conclusion, not the process of arriving at that conclusion.)
本题比较重要的一点是能看出选项(A)的这个倒装句来，正常语序为：
a cycle in which personal computer users, especially corporate consumers, are replacing their PC's with more powerful models has begun.
这里的倒装是因为cycle的定语从句实在是太长了，放在句中会使得主干部分被相隔太远，不容易让读者看明白。
during身后需要连接一个独立而确定的时间段（例如five years），而不能连接类似于recent times这样的模糊时间
"Up" is redundant, since "until" already carries this meaning.
• The sentence implies that the Inuit are no longer nomads.
If they were still nomads, the sentence wouldn't say "until recently"; it would say "until now" (or some equivalent). Remember that "recently", albeit not too long ago, is still a time in the past.
So, you need the past tense.
more than three times as many 【independent institutions of higher education charge tuition and fees of under $8,000 a year 】as 【 ( independent institutions of higher education) charge over $16,000】.
选项A：首先，since应改为over。介词since身后只能接时间点而不能接时间段。例如：
since 1989, since today
over身后通常接时间段，例如：
over 3 days, over one month.
因此，由于the past few years是一个时间段，所以不能用since来连接。由于主语的核心词movement是一个单数名词，需将have改为has。
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The actual mistake in choice D is the word "arrangement". "Arrangement" doesn't refer to the process of arranging something; it refers to the arrangement that results from that process.
(Similarly, "as I was judging xxxx" makes sense. "During my judgment of xxxxx" doesn't, because a judgment is a conclusion, not the process of arriving at that conclusion.)