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Find out whether there is any grammatical error in below sentence.
This book is / designed to increase / a working knowledge of / spoken and written English.

A. This book is

B. designed to increase

C. a working knowledge of

D. spoken and written English

E. No error

Answer: Option C

Solution(By Examveda Team)

the working knowledge of

This Question Belongs to Competitive English >> Common Error Detection

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