Multiple choice

No one ___ projections of demographic shifts are reliable and valid in the future.

  1. know how

  2. knows even

  3. knows whether

  4. know who
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sentence requires a conjunction to introduce an indirect question. 'Knows whether' is grammatically correct, as 'whether' introduces the uncertainty of the projections.

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