[ Quantifiers ]
These two boys look identical. They ________ twins.
A. must have been
B. should be
C. must be
D. should have been

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Verb + InfinitiveAlong & AgainstGrammar: Have toGrammar ( going to)Coordinating ConjunctionFuture Time and TensesSimple TenseTenses and Time MarkersPhrases and TensesModal Verbs - ObligationOther quiz:
Preposition of Direction › ViewThe hypermarket is located ________ the office building and the bank.
A. among
B. over
C. between
D. above
Grammar › View
The difference was very __________.
A. subtle
B. major
C. irritable
