[ Past Tenses ]
They __________ (debug) for two hours before they found the error.
A. debugged
B. had debugged
C. were debugging
D. had been debugging
Select your answer:
Random Topics:
Modal Verbs for PossibilityAdverbs of Frequency & Simple Present TenseModal Verbs for SpeculationPrepositionSimple and Past TensesSpeech TensesGrammar - Countable/ UncountableElectricity VocabularyPrepositions of Time and PlaceTimeOther quiz:
Simple Present Tense › ViewIt _____ sense.
A. doesn’t make
B. doesn’t makes
C. don’t make
D. –
Present Simple (-) › View
We _____________ ( not have ) breakfast at six o´clock.
A. don´t have
B. doesn´t have
C. aren´t have