Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions from 7 to 21.They ______ the floor when their mother came home. A. cleaned
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions from 7 to 21.
They ______ the floor when their mother came home.
A. cleaned
B. were cleaning
C. clean
D. are cleaning