[ Grammar ]
Select the correct word to fill in the blank.
We _____ not know why he is always absent.
A. do
B. does

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Infinitives or GerundsContractions and ConjunctionsVerb-ing and InfinitiveGrammar: is/are/was/werePersonal & Possessive PronounsPast and Present TensesFor vs SinceSimple Present - Negative & InterrogativeNouns, Pronouns, Antecedents, and Singular and PluralPresent Simple and Present ContinuousOther quiz:
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Kyle and Lisa often____________ math together.
A. study
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C. studied
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