[ Modal Verbs ]
We _______ missed the bus because it arrived earlier than usual.
A. could have
B. must have
C. might have
D. should have

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Gerund or InfinitivesModal Verb in Passive VoiceSuch...that, so ......thatA/AnPast Tense (Regular and Irregular)Past Continues TenseModifiersCoordinating ConjunctionShould and Shouldn'tProgressive TenseOther quiz:
Vocabulary › ViewThis is how high or low a sound is
A. Light
B. Noise
C. Pitch
Vocabulary & Grammar › View
The _____cliffs are a beautiful part of our heritage.
A. limestone
B. valley
C. ecosystem
D. interact