14. Choose the sentence which has the closest meaning as the given one:
“Jeft did a research on thermal pollution in 2010.”, Anna said.
A. Anna said that Jeft had done a research on thermal pollution in 2010.
B. Anna said that Jeft did a research on thermal pollution in 2010.
C. Anna said that a research on thermal pollution had been done by Jeft in 2010.
D. Anna said that a research on thermal pollution was done in 2010 by Jeft.
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