Question

Choose the response that could improve the sentence by substituting the italicized portion. If the sentence construction is acceptable, then choose ‘E’.

The scientist worked on the problem until was found a solution.

• A. and found at last a solution
• B. and at last a solution was found
• C. until he had found a solution
• D. until he found a solution
• E. NO CHANGE

Answer 1

Answer: (D)

until he found a solution

A clause in the active voice must be followed by another clause in active voice and the tenses of both these clauses remain the same.

Option D is the correct answer because it is in the form of an active clause and is in the simple past tense form as is the clause before.

Options A, B and C are incorrect because none of these adhere to the conditions stated above.

Option E is incorrect because there can be a change in the sentence.