[ Modal Verbs ]
They _______ seen the sign; it was right in front of them.
A. might have
B. must have
C. could have
D. may have

Random Topics:
Progressive Verb TensesGrammar - Countable/ UncountableRelative Clauses PronounsCoordinate ConjunctionPresent Simple and ContinuousWH- Question WordsArticles A and AnAdjectives with -ED and -INGGrammar (Possessive Pronouns)Grammar for IELTSOther quiz:
Grammar › ViewThis is a secret between you and me, so we_______ tell anyone.
A. needn’t
B. don’t have to
C. mustn’t
Grammar › View
Are these sneakers _____?
A. Its
B. Mine
C. Yours
Grammar › ViewI _____ for you when your train _____ tomorrow.
A. am waiting, will arrive
B. will be waiting, arrive
C. will be waiting, will arrive
Conjunctions › View
Come _______ you like.
A. yet
B. since
C. whenever
