Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.Not until he entered the office when he realized th
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
Not until he entered the office when he realized that he had forgotten his wallet.
A. Not until he
B. when
C. that
D. had forgotten