Direction: In the following questions, some parts of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is your answer. If a sentence is free from error, then your answer is (4) i.e. No error.
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Solve the question according to given instruction
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- Water contamination has become more serious
- since chemists have begun to use
- new substances.
- No error.
Correct Option: B
Here, not an Infinitive butGerund i.e.since chemists have begun using new substances is the right usage
