Multiple choice

The consultant, who is employed [a]/by several firms, is very [b]/knowledgeable on mutual funds[c]/ and junk bonds[d].

  1. a

  2. b

  3. c

  4. d

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The correct preposition after 'knowledgeable' is 'about' or 'in', not 'on'. We say someone is 'knowledgeable about' or 'knowledgeable in' a subject, not 'knowledgeable on'. This is a fixed collocation in English - the preposition 'on' does not pair with 'knowledgeable'.