[ Grammar ]
He … taking a bath when you knocked on the door.
A. is
B. was
C. were
D. has

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DEGREE COMPARISONParts of Speech and Compound SentencesConditional and Mix Conditional SentencePassive VoicesTenses, Tag Questions, Phrasal VerbsAbstract NounsFrequency AdverbsDegrees of AdjectivesAdverbial Clause of ConcessionSubordination ConjunctionsOther quiz:
General Knowledge › ViewWho painted the Mona Lisa?
A. Sandro Botticelli
B. Michelangelo
C. Leonardo Da Vinci
D. Raphael
E. NONE OF THE ABOVE
Grammar › View
Mark _____________ (study) biology since high school. (PRESENT PERFECT TENSE)
A. has studied
B. had studied
C. will have studied