[ Modal Verbs ]
The snake disappeared from the zoo some time on Thursday. ‘It ____ slipped out of the cage while the door was open.’
A. had to
B. should have
C. needn’t have to
D. must have

Random Topics:
Present Perfect: for/sinceSubject Verb Agreement; Indefinite PronounsVerb + PrepositionNouns and QuantifiersSynonymsSentence Types and ConjunctionsVerb to haveTenses & PrepositionReporting VerbsConditional Sentence Type 3Other quiz:
Grammar › ViewThat is the woman ………………….. husband is a pilot.
A. why
B. what
C. whom
D. whose
Passive Voice › View
A new hotel ________ by them.(Present Perfect)
A. has been built
B. had been built
C. have been built
D. will be built
Conditionals › ViewA third conditional sentence is used to express something…
A. probable
B. improbable
C. impossible
Grammar ( going to) › View
They are ……………. do sports.
A. go to
B. going to
C. going