Multiple choice

The greenhouse effects occurs_______ heat radiating from the sun

  1. when does the Earth´s atmosphere trap

  2. when the Earth´s atmosphere traps

  3. does the Earth´s atmosphere trap

  4. the Earth´´s atmosphere traps
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sentence requires an adverbial clause of time introduced by the conjunction "when" followed by normal subject-verb word order ("the Earth's atmosphere traps"). Option A incorrectly uses question word order ("does... trap"), and Option C is a question structure that does not fit a declarative subordinate clause.

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