Single correct option
Not only [he forgot] the keys but also lost the wallet.
- A. he had forgotten
- B. has he forgotten
- C. No improvement
- D. did he forget
Show answer and solution
Answer: (D) did he forget
When a sentence begins with 'Not only', the auxiliary comes before the subject (inversion): 'Not only did he forget'. The simple past matches 'lost' in the second clause. The other options either skip inversion or change the tense. After negative or restrictive openers such as not only, hardly, scarcely and rarely, the auxiliary comes before the subject.
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