In the following questions, a sentence/ part of the sentence is printed in bold. Below are given alternatives to the bold sentence/part of the sentence at which may improve the sentence. Choose the correct alternative. In case no improvement is needed, your answer is No Improvement.
The correct answer is option number -D.
The given sentence is of question tag.
The main sentence is in positive form.So question tag will be negative.
Since the verb(knows) is singular we will use `does' while making question tag.
Option D will be the correct answer.
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