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

Câu 25: Mark the letter A,B,C or D on your answer sheet to indicate the correct answer in thefollowing question.Since 1950 the world……….nearly one-fifth of the soil from its agricultural land and one-fifth of itstropical forests.A. has lostB. was losingC. had been lostD. lost