Multiple choice

Directions: Choose the appropriate option and fill in the blank.

The higher you go, the more difficult it _________ to breathe.

  1. has become

  2. becomes

  3. is becoming

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

This is the case of present indefinite tense. As the sentence mentions about a 'general fact' of present, so we should use the first form of the verb without any helping verb. Thus, 'becomes' is the right choice.

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