[ Modal Auxiliary Verb ]
You …… sit the exam. It’s optional.
A. Don’t have to
B. Mustn’t

Random Topics:
Grammar and Passive VoiceAdverbial ClauseNoun, Verb, AdjectiveSimple, Compound, Complex SentencesInfinitives and GerundsAdverbConditional SentencesVocabulary and DefinitionsSo Such Enough TooSubordinating ConjunctionsOther quiz:
Grammar › ViewA:I drink ___ milk before(在……之前)I go to bed every day. B:Me too. It helps me have a good night’s sleep.
A. a glass of
B. a
C. any
D. glass
Definite and Indefinite Article › View
I watched _______ video you had sent me.
A. a
B. an
C. the
D. no article
