[ Irregular Verb ]
Nanita has ______ how to convert from active to passive since before she could walk.
A. known
B. knew
C. knowen
D. knowed

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Preposition and Preposition PhraseTenses and VerbsGrammar - Compound SentencesThe Past SimpleSo or SuchPrepositions and ConjunctionsComperative and SuperlativeConditional Sentence 0, 1used to vs be used to vs get used toGrammar and EssayOther quiz:
Simple and Continuous Present Tense › ViewPeter usually ……………………. when he do his homework.
A. is concentrate
B. concentrating
C. concentrates
D. concentrate
Verb Tenses › View
I have not seen Tom … then.
A. since
B. for
