Mr. Thomas talked .... about the successes of his institute in the past year.
A.
at a great length
B.
for great length
C.
at great length
D.
for a great length
E.
at great lengths
Correct Answer: Option C
Explanation
The phrase "at great length" is an idiomatic expression that means in great detail or for a long time. The article 'a' or the plural 's' should not be attached.
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