Mark the letter A, B, C, or D to indicate the correct answer: Only after she hadĐoạn văn8/30Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Only after she had finished the course did she realize she _____ a wrong choice.had madehas madehad been makingwas makingGiải thíchĐáp án A.