[ Grammar ]
While mom was watching TV, I _______ my homework.
A. am doing
B. was doing
C. had done
D. has done

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Past Perfect and Past Perfect ContinuousNoun and Modal Verbsas...as, comparatives, superlativesPassive with ModalsSimple and Continuous Present TenseWill vs be going toModal Verbs and ConjuctionsIdiomsTense,noun,preposition,quantityNoun Phrases and AdverbialsOther quiz:
Present Perfect › ViewThat’s the smallest car I’ve _________ driven.
A. ever
B. never
C. already
D. still
Articles and Demonstratives › View
Choose the correct article: ___ car
A. a
B. an
C. some
D. the
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A. with
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C. for
D. in
Grammar › View
I’ve always ____ cats are smarter than dogs
A. think
B. thinks
C. tought
D. thought
