Multiple choice

Directions: Choose the correct option to fill in the blanks.

He _________ himself _________ to complete the project.

  1. knocked, out

  2. knocked, together

  3. knocked, under

  4. knocked, off
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

'Knocked oneself out' means 'worked much harder than normal'. This meaning fits in the framework of the meaning of the sentence.

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