[ Modal Verbs ]
She … what happened unless she was there.
A. couldn’t have known
B. couldn’t know
C. mightn’t have known
D. mightn’t know

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Present Perfect and Present Perfect Progressive TensesGrammar - must & have toModals, Phrasal Verbs, Gerunds and InfinitivesSimple Past Tense & Future TenseFirst & Second ConditionalConditionals and Modal VerbsComparative AdjectivePast SimpleFuture - Will and Be going toAdverb of MannerOther quiz:
Comma › ViewCorrect or Incorrect Grammar?
My dad works in a factory, my mom works in an office, and I work at school.
A. Correct
B. Incorrect
Article & Preposition › View
We often watch _________television
A. the
B. a
C. an
D. no article
Grammar › ViewMt Everest is …………………highest mountain.
A. a
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Comparatives and Past Perfect Tense › View
I was sure that I ___________ her before.
A. had saw
B. seen
C. had seen
