[ Grammar ]
. While Mrs Tan ___________ the floor, the pizza deliveryman rang the doorbell.
A. mop
B. will mop
C. has mopped
D. was mopping

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Articles with SubstancesPast and Present TensesSpeech TensesGrammar-Present Continuous-Sentence MakingConnectives (because, due to, owing to, because of)Adjective and AdverbGrammar: AgreementWh-QuestionModal Verbs for SpeculationGrammar MistakesOther quiz:
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Dad spoke to James and me about the mess. He told ______ to clean it up.
A. him
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