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

Câu hỏi

Smokers generally do know that smoking is extremely harmful, but it’s just that they can’t help_______it.

A. doing

B. to do

C. do

D. having done

Đáp án
A. doing

Câu hỏi thuộc Bài tập:

E11- GS- Unit 4- Practice 6