Student or Learner
It's probable that there were many severe storms in this area ..... ships sank.
1. so many
2. that many
3. and many
4. and that many
Why not No.3?
My opinion: No.3
Answer key: No.4 ( I haven't seen this structure before )
So 5jj it must be kind of ellipsis. Right?
I note that bhaisahab says that 3 is possible. It is grammatical, but ambiguous. It could be taken that the storms were 'probable' but [that] you are certain that the ships sank. Using 'that' (4) specifically links the sinking ships to 'probable'.