He smokes too much; perhaps that’s why he can’t get rid of his cough.

A. If he didn’t smoke so much, he may get rid of his cough.

B. If he smoked less, he might be able to get rid of his cough.

C. If he smoked so much, he couldn’t get rid of his cough.

D. If he does not smoke, he may not have his cough.

B

Kiến thức: câu đồng nghĩa

Giải thích:

Đáp án A sai cấu trúc câu điều kiện loại 2 ( If + mệnh đề quá khứ, S + would + V)

Đáp án C và D sai nghĩa so với câu gốc 

=> chọn B