Which form of careful best completes this sentence?

Tomorrow at training, Frances must be __________ than she was today.

A.
carefully

B.
more careful

C.
most careful



Answer :

more careful (B)  than today (because it compares with today and tomorrow .)

hope it helps :) 

So,

Normally, this type of sentence means that (subject) already was careful, and that she has to be more careful.

She can't be most careful, because that is impossible.

Therefore, option B is the correct answer.

Frances must be more careful than she was today.

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