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Climate experts, after reviewing this year's recordings of the atmosphere, is not surprised by how warm it has been.
A. Climate experts, after reviewing this year's recordings of the atmosphere, is not surprised by how warm it has been
B. After reviewing this year's atmospheric recordings, climate experts are not surprised by how warm it has been
C. Climate experts are not surprised by how warm it has been after reviewing this year's recordings of the atmosphere
D. After reviewing this year's atmospheric recordings, climate experts are not surprised by how warm they have been
E. Climate experts, after reviewing this year's atmospheric recordings, are not surprised by how warm this has been
OFFICIAL EXPLANATION
Climate experts, after reviewing this year's recordings of the atmosphere, is not surprised by how warm it has been.
A. Climate experts, after reviewing this year's recordings of the atmosphere, is not surprised by how warm it has been
Incorrect.
This answer choice is grammatically incorrect. The plural subject Climate experts does not agree with the singular verb is.
What helps us identify this question as a Subject Verb Agreement question and identify the mistake is the following Stop Sign: A long complex subject / a long distance between the subject and the verbB. After reviewing this year's atmospheric recordings, climate experts are not surprised by how warm it has been
This answer choice corrects the original Subject Verb Agreement mistake and uses the concise phrasing atmospheric recordings. The pronoun "it" can also serve as the subject of a clause that has no natural subject, such as "it is raining" or "it is warm". The point to remember is that not every "it" must refer to another noun - the pronoun in this answer choice B doesn't refer to anything, but is actually standalone.C. Climate experts are not surprised by how warm it has been after reviewing this year's recordings of the atmosphere
Although this answer choice corrects the original Subject Verb Agreement error and is grammatically correct, stylistically it is not the most concise of the five answer choices. There's another grammatically correct answer choice that is more concise than this one. Look for it!D. After reviewing this year's atmospheric recordings, climate experts are not surprised by how warm they have been
Incorrect.
Although this answer choice corrects the original Subject-Verb Agreement error, the use of the pronoun they creates an illogical sentence.
The plural pronoun they can only refer to a previously mentioned plural noun - either to experts or recordings. In either case it makes no sense to say that they have been warm. Neither the recordings nor the experts have been warm - what has been warm is the weather. Search for an answer choice that expresses this idea in a way that is both logical and grammatically correct. E. Climate experts, after reviewing this year's atmospheric recordings, are not surprised by how warm this has been
Although this answer choice corrects the original subject-verb agreement error, it is still grammatically incorrect. This is a pronoun, which means it derives its meaning from a previously mentioned noun. However, there is no such noun in the sentence. Thus, the use of this is incorrect.