"逗号后解释的句子一般是前一个句子的从句，所以需要引导词，如果是AB的“on the basis”或“on the grounds”的话是不需要有逗号的。C中副词没有修饰对象。
这句话有点难理解，“相邻的两州建设大型医院是对资源的浪费（完整句子），因为要避免设施的重复建设”。所以造成浪费的是duplication of facilities，设施的重复建设，而不是duplicated facilities。
连词since使得It seems that elk would be mountain dwellers和they once ranged over virtually all of the continental United States变成了“因果关系”，但逻辑上“现在Elk像是高山居住者”和“他们曾经在各个地方生存过”是转折关系，应将since改为but。
In English, collective nouns for ethnic groups / families/dynasties / proper names for sports teams, etc, will be plural (unlike other collective nouns):
The Welsh have delightful accents.
The Medici were avid art collectors.
The Heat (basketball team) play in Miami.
So in this sentence, "the Shang" must be plural. Eliminate C.
In E, "and" should connect two verbs. However, "and well known" is a participial modifier. This isn't parallel.
The correct answer is D.
第一，在习语上，“遭受”应该用be not subject to而不是be not subject of；第二，as身后的those that damage collections in the United States是名词短语，这表示as在本选项中是介词。作介词时，as意为：“作为”。在逻辑上，“极端的气温和湿度”本身就是毁坏美国展品的东西，而不必要说“极端的气温和湿度”是“作为”毁坏美国展品的。
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.
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"逗号后解释的句子一般是前一个句子的从句，所以需要引导词，如果是AB的“on the basis”或“on the grounds”的话是不需要有逗号的。C中副词没有修饰对象。这句话有点难理解，“相邻的两州建设大型医院是对资源的浪费（完整句子），因为要避免设施的重复建设”。所以造成浪费的是duplication of facilities，设施的重复建设，而不是duplicated facilities。