Sea Watch Foundation has also run courses (45)___________ over twenty years, making it one of the most experienced organizations for training observers and students interested in sea animals

Sea Watch Foundation has also run courses (45)___________ over twenty years, making it one of the most experienced organizations for training observers and students interested in sea animals in the country.
A. for
B. in  
C. during
D. since

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Chọn A

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