Fill in the blank with the most appropriate word. We must be very careful when we drive, ____ we?
A
mustn't
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B
must
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C
oughtn't
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D
don't
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Solution
The correct option is A mustn't Option A is correct as "must not we" re-emphasizes the first part of the sentence "the need to be very careful while driving". The subject and verb agree and in doing so, the second reference is correct only if it uses the same subject.