Question

Which word correctly completes the sentence?

Steve couldn't __________ written the letter by himself.

A.
have

B.
of

think its A

Answer 1

I would go with B.

I know it may not sound right, but it is, because it's talking about present-tense, not past-tense. If the word was "that" it would be "have," but since it is "the" it is going to be "of."