[ Grammar ]
__________ knows the answer to this riddle.
A. Someone
B. Whose
C. Theirs
D. Whom

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Grammar › ViewWhat time is this? This is….
A. twenty past two
B. twenty five past two
C. a half past two
D. a quarter past two
Tenses › View
How long ______ they ______ each other? ( to know )
A. do ____ know
B. have _____ known
C. have ______ been knowing
D. did _____ know