Multiple choice

Directions: Fill in the blank with the most appropriate of the given options.

The initial objects with which scientists _________ are the objects of perpetual experience.

  1. concerned

  2. were concerned

  3. are concerned

  4. had to be concerned

  5. must concern
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sentence is in present tense ('are'), so the relative clause should also use present tense 'are concerned'. 'Concerned' would be a past participle needing an auxiliary, 'were concerned' is past tense, and 'had to be concerned' introduces unnecessary modal and perfect aspect.

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