Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions

----- Nội dung dịch tự động từ ảnh -----
C. and then it burned my tongue
D. to have burned my tongue
Mark the letter A, B, C, or D to indicate the underlined part that needs
correction in each of the following questions.
20. His doctor advised him to stop to smoke.
A
B
C D
21. At first life was difficult for me because of I didn't understand English.
A
C
D
22. Copper comes from seven types of ores that also contain the other materials.
C
D
23. Silicon chips contain thousands of circuits in an area as smaller than a fingernail.
A
D
24. Although Connecticut occupies a small area, its weather can vary from one
A
B
C
area to others.
D