Ever since the use of natural gas became widespread, London isnt ---- ...
Ever since the use of natural gas became widespread, London isn't such a polluted city as it was ten years ago.
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Ever since the use of natural gas became widespread, London isnt ---- ...
Explanation:
The correct answer is option B, "such / as". This is because the sentence is comparing the level of pollution in London now with the level of pollution ten years ago. The phrase "such as" is used to introduce examples or specific instances, and it is commonly used in comparisons.
Breakdown of the sentence:
- "Ever since the use of natural gas became widespread" - This is the introductory clause that sets the timeframe for the comparison.
- "London isn't" - This is the main clause that states the current condition of London.
- "a polluted city" - This is the first part of the comparison, indicating the previous condition of London.
- "as it was ten years ago" - This is the second part of the comparison, specifying the condition of London ten years ago.
Why option B is correct:
- The phrase "such as" is used to introduce examples or instances. In this context, it is used to indicate that London was previously a polluted city, among other examples or instances.
- By using "such as" in the sentence, it creates a parallel structure and maintains the logical comparison between the current condition and the condition ten years ago.
Example:
- Ever since the use of natural gas became widespread, London isn't such a polluted city as it was ten years ago.
- This sentence effectively conveys that London's level of pollution has decreased compared to ten years ago, without explicitly stating the specific examples or instances of pollution.
Other options explained:
- Option A, "as / as", is incorrect because it is used for indicating equality or similarity, rather than comparing a change in condition.
- Option C, "so / that", is incorrect because it is used to express a cause-effect relationship, which is not applicable in this context.
- Option D, "more / than", is incorrect because it indicates a comparison of degree or quantity, rather than a comparison of condition.
- Option E, "enough / to", is incorrect because it implies sufficiency or adequacy, which is not suitable for the comparison being made in the sentence.