Question

Q. What a sensation it would cause if it __ now discovered that such a vital diary had been left behind.
A. is
B. be
C. was
D. were

Answer 1

Answer :

C). Was. Will be filled in the given space.

Answer 2

The correct option is C). Was.

This will fill in the given space.So, the sentence will be: What a sensation it would cause if it was __ now discovered that such a vital diary had been left behind.

Fill up the gap is to add what is needed to something to make it complete sense as well a complete sentence.