Direction: In the following questions, some of the sentences have errors and some have none. Find out which part of a sentence has an error. The number of that part is your answer. Your answer is (4) i.e., No error.
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Solve the question according to given instruction
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- Knowledge of
- at least two languages
- are required to pass the examination
- No error
Correct Option: C
is will replace are because –
The Verb of a sentence always agrees with the Subject of the sentence, not with the object of a preposition.
Here, knowledge is the Subject of the sentence, two languages is the Object of of (Prep.)
Look at the examples given below : 
