[ Past Perfect Tense ]
They _____ a lot the days before, so they were ready for the exam.
A. had studied
B. had study
C. have study
D. hadn’t studied

Random Topics:
Grammar and PrepositionInfinitive GerundGrammar - Present and Past PassiveTenses StructureFuture Simple TensesTime ExpressionsActive and PassiveComparatives and Past Perfect TenseGrammar (Adjectives)IELTS VocabularyOther quiz:
Grammar and Vocabulary › ViewIf sb is _____, they do dangerous things without thinking about the consequences of their actions
A. fickle
B. brash
C. reckless
D. sullen
Subordinating Conjunction › View
He kept running ___ he was out of breath.
A. until
B. although
C. because
D. when
Present Tense › ViewHe _____ late. I can’t put up with anymore.
A. always come
B. always comes
C. is always coming
D. comes
Tenses › View
The engine ____ smoothly when we started the car at 9 AM yesterday.
A. was running
B. runs
C. is running
D. will run