Concept:Identify the two words that are misplaced in the sentence and need to be swapped to make it grammatically and logically correct.
Explanation:The original sentence is: "Albert Einstein’s intelligence left behind a legacy of knowledge that
understand physics and how we
changed gravity."
The words
understand (C) and
changed (D) are in the wrong positions.
"Understand" should describe the legacy's effect on physics, so it must come after "how we".
"Changed" should describe what the legacy did to physics, so it must come before "physics".
Therefore, we need to interchange C and D.
The correct sentence becomes: "Albert Einstein’s intelligence left behind a legacy of knowledge that
changed physics and how we
understand gravity."
This matches option A: C-D (swap C and D).
Answer:Option A (C-D)