Multiple choice

since the 1970's, riding bicycles___ in the United States.

  1. becomes increasingly widespread

  2. become increasingly widely spread

  3. has become increasingly widespread

  4. has increased and becomes spread widely
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The phrase 'since the 1970's' requires the present perfect tense to indicate an action starting in the past and continuing to the present. 'Has become' is the correct verb form.

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