kivalo wrote:
I understand that in A (after the comma) is wrong. But what's wrong with the comparison, can't it be:
While it costs about the same to run nuclear plants as [it costs to run] other types of power plants?
There is no comparison error in option A. In addition to the error you stated, there are three more errors in the option:
1. The relative pronoun "that" wrongly refers to " plants" - it should refer to "fixed costs".
2. The verb "makes" should be singular
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