MARK THE LETTER A,B,C OR D ON YOUR ANSWER SHEET TO INDICATE THE CORRECT ANSWER TO THEFOLLOWING QUESTION

Câu 50: Mark the letter A,B,C or D on your answer sheet to indicate the correct answer to thefollowing question.- Only one of ourgifted students to participate in the final competition.A.was choosing B.chosen C.has been chosen D.have been chosen