Question

They had better ----------. They are becoming weaker and weaker day by day.

A. Stop smoking

B. Stopped smoking

C. stopping to smoke

D. to stop smoking

Note:Explain your answer !​

Answer 1

D: to stop smoking
So you can cross out a and b already because it starts with caps which wouldn’t make sense which leave you with c and d so you could narrow it down to which on would make sense in a complete sentence which is D.