Mr. Thomas talked .... about the successes of his institute in the past year
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Correct Answer: Option C
Explanation:
Explanation:
"At great length" is the correct idiomatic expression that means for a long time or in great detail. It describes how much time Mr. Thomas spent talking about the topic.
Why the other options are incorrect:
A. at a great length – while this might sound somewhat reasonable, it’s not the typical phrasing in English.
B. for great length – this is not a correct expression in this context.
D. for a great length – this also does not fit as naturally as “at great length.”
E. at great lengths – incorrect use of plural form here.
Explanation:
"At great length" is the correct idiomatic expression that means for a long time or in great detail. It describes how much time Mr. Thomas spent talking about the topic.
Why the other options are incorrect:
A. at a great length – while this might sound somewhat reasonable, it’s not the typical phrasing in English.
B. for great length – this is not a correct expression in this context.
D. for a great length – this also does not fit as naturally as “at great length.”
E. at great lengths – incorrect use of plural form here.