A)
was knowing
B)
have known
C)
had known
D)
No improvement

Correct Answer :   had known

Recently Updated in Sentence Improvement Questions
Q .
Taxpayers are to be conscious of their privileges.
A)
need
B)
have to
C)
ought to
D)
No improvement

Correct Answer : Option (B) :   have to

Q .
He should move on to the next point, and not harp one sting only.
A)
harp on string only
B)
harp only one string
C)
harp upon one string only
D)
No improvement

Correct Answer : Option (C) :   harp upon one string only

Q .
Whenever my students come across new words, I ask them to look for them in the dictionary.
A)
to look it up
B)
to look at them
C)
to look them up
D)
No improvement

Correct Answer : Option (C) :   to look them up

Verbal Ability MCQ's

Synonyms
Antonyms
Tense
Adjectives
Selecting words
Homophones
Gerunds
Identify the Errors
Identify the Sentences
Plural Forms
Nouns
Articles
Prefix
Suffix
Sentence Formation
Tag Questions
Prepositions
Substitution
Joining Sentences
Sentence Improvement
Fill in the blanks
Paragraph Formation
Sentence Arrangement
Active and Passive Voice