Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Yesterday, when I ________ dinner, my best friend came over. A. am cook
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Yesterday, when I ________ dinner, my best friend came over.
A. am cooking
B. was cooking
C. have cooked
D. will cook