Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction. The shopkeeper warned the boys don't learn their bicycles against his windows.
A.The
B.don't
C.their
D.against
* Đáp án
B
* Hướng dẫn giải
Đáp án B
– warn somebody against something/doing something : cảnh báo ai không được làm gì.