The two groups entered _______ an agreement after a protracted discussion.
A.unto
B.at
C.in
D.into✓ Correct
Explanation
The phrase 'enter into an agreement' is the standard collocation in English, meaning to formally make an agreement. 'Into' indicates the formal undertaking of the agreement. 'Enter in' or 'enter at' are not idiomatic, and 'unto' is archaic and inappropriate here. Therefore, 'into' is the correct preposition.
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