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Question 77

Do not call the technician beforehand. Check the panel later and call only ___ the warning light is still on then.

  1. ifCorrect answer
  2. in case
  3. unless not
  4. unless

Explanation

If is right because the call happens later only after the warning light is found to be on. In case would describe a call made beforehand as a precaution, which the instruction explicitly rejects.

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Question 77: Do not call the technician beforehand. Check the panel… · English Conditionals · Questena