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

Câu hỏi

I've tried those tablets and they are not_______in helping me stop coughing.

A. effective

B. successful

C. profitable

D. helpful

Đáp án
A. effective

Câu hỏi thuộc Bài tập:

E9- Vào 10- Đề ôn 6