Mark the letter A, B, C, or D on...

Câu hỏi: 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
My mother (A) told me to (B) watch the milk and (C) don’t let it boil (D) over.

A. told

B. watch

C. don’t

D. over