After so many trials, the experiment __________
Question
After so many trials, the experiment __________
Options
A)
paid up
B)
paid for
C)
paid out
D)
paid off

Related Lesson: Grammatical Concord | English Lexis and Structure
The correct answer is D.
Explanation:
After so many trials, the experiment paid off.
pay off: (of a course of action) yield good results; succeed
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After so many trials, the experiment paid off.
pay off: (of a course of action) yield good results; succeed