Multiple choice

Directions: The sentence below has a part underlined. The underlined part may have an error of grammar or syntax. There are five options that seek to correct the error (including an option that simply repeats the sentence). Select the part that best represents the replacement for the part underlined.

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 works.

  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

 Corrects the error of subordinating conjunction. 'Unless' is a conjunction of condition while 'until' means 'till the time when'.

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