[ Past Perfect and Past Perfect Continuous Tense ]
My friend didn’t know the answers, because he …. …. for the test.
A. wasn’t studying
B. hasn’t studied
C. hadn’t studied
D. didn’t study

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GerundPast Perfect and Past Perfect Continuous TenseSuperlative & Comparative AdverbsVocabulary and PrepositionsWill & Be going toHave as verb and auxiliarySimple Past Tense and Present Continuous TenseGrammar - Reflexive PronounsVerb Moods and Vague PronounsGrammar AssessmentOther quiz:
Present Tenses › Viewyou / listen to music / now?
A. You are listening to music now?
B. Are you listening to music now?
C. Do you listen to music now?
D. You listen to music now?
Vocabulary › View
Lemon is………..
A. sweet
B. bad
C. sour