Question

Fill in the blank with the most appropriate word.
Helen must work hard, ____ she?

• A. mustn't
• B. doesn't
• C. must
• D. does

Answer 1

The correct option is A mustn't

In the given sentence, the answer is a question tag. In question tags, the auxiliary used must be the same as the one in the sentence. Also, if the sentence is positive, the tag should be negative. Thus, the answer must employ the auxiliary 'must' and it should be negative.

Option A is correct. It uses the auxiliary 'must' and is negative. Thus, it meets the required conditions and is the correct answer.

Option B is incorrect. 'doesn't' is negative but does not use the auxiliary 'must'. Thus, it is incorrect.

Option C is incorrect. 'must' uses the auxiliary 'must' but it is positive. Thus, it is incorrect.

Option D is incorrect. 'does' is not negative and does not use the auxiliary 'must'. Thus, it is incorrect.