Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions 
These plants and flowers _______ by my mother twice a day
A. water       B. have watered       C. are watered       D. will water 
NÊU RÕ CẤU TRÚC NHA !!!