Multiple choice

Directions: This question presents a sentence, all or part of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

Edison was tireless in his persistence to change a subject into something else through trial and error unless he found the idea that worked.

  1. a subject into something else through trial and error unless he found the idea that worked.

  2. a subject into something else through trial and error unless he found the idea that work.

  3. a subject into something else through trial and error until he found the idea that worked.

  4. a subject from something else through trial and error unless he found the idea that worked.

  5. a subject into something through trial and error unless he found the idea that worked.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sentence bears the error of conjunction. Use of 'unless' is incorrect in this sentence. 'Unless' is a conjunction of condition while the sentence implies 'till the time when'. This option corrects the error.

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