Multiple choice

Directions: Fill in the blank with the correct option.

After the disastrous and fatal explosion of the Challenger, an investigation ______ was not ready for operation.

  1. proved that the space shuttle

  2. proved that a space shuttle

  3. proved that space shuttles

  4. proved that space shuttle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The sentence needs a subject and verb to complete the clause following 'investigation'. 'Proved that the space shuttle' provides the necessary structure.

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