Multiple choice

Directions: Fill in the blank with the most appropriate option.

Not only _______ to determine the depth of the ocean floor, but it is also used to locate oil.

  1. we use seismology

  2. is seismology used

  3. seismology is used

  4. seismology finds usage

  5. do we use seismology
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 For sentences beginning with negative words, the auxiliary is placed before the subject. Also the latter part of the sentence is in the passive voice.

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