Multiple choice

Directions: Select the best option and complete the sentence.

We ___________ do our duty at all costs.

  1. had to

  2. must

  3. used to

  4. may
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Doing the duty can be either a duty or a responsibility. But here usage of the words 'at all costs' demostrates the obligation, and for obligations we use 'must'.

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