Fill in the blank with a suitable verb:
Vegetables __________ be washed carefully.
A verb is used to express an occurrence, action, or state. It is the grammatical centre of the predicate in a sentence.
An auxiliary verb is a verb which gives is used in the formation of tenses, moods, tones, etc.
Option B is correct as be washed indicates the use of have to. Also, the subject is plural.
The other options are wrong as no other tense can be used here.
The correct answer is B) Have to