Firstly you should
think over the meaning of the words
and then use them
No error
Answer is Wrong!
Answer is Right!
The correct answer is: D. No error
The sentence is grammatically correct. The word “firstly” is an adverb that introduces a list of items, and the word “then” is a conjunction that joins two clauses. The sentence is clear and easy to understand.
The other options are incorrect because they
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