I am sorry I don’t know how to use the ...

[ Grammar ]

I am sorry I don’t know how to use the computer.If only I (know)______ how to use it
A. knew
B. known

Select your answer:

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Prepositions of Time and Place BASIC GRAMMAR - PRONOUNS Past Simple, Past Continuous, Past Perfect Noun, Quantifiers and Suffixes Transitive and Intransitive Verb Pre-intermediate Noun Phrases Tenses Practice Conditionals (0 - 1 - 2)

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