[ Grammar ]
. I don’t know ___ book this is.
A. who’s
B. whose
C. whoms

Random Topics:
Verb Forms and PrepositionsGrammar - Wh QuestionsWill and Going toTenses & AffixesPresent Perfect and Past TensesNoun, Adjective, and Adverb ClausesVerb-ing and Infinitive-ed or -ingComparative and Superlative AdverbsFuture - Will and Be going toOther quiz:
Grammar › ViewI get up at… (9:45)
A. A quarter to ten
B. A quarter past ten
Simple Present Tense › View
It … most of the time.
- happen
- happens