[ Grammar ]
He started surfing the net hours ago. Has he stopped ___________ yet?
A. to surf
B. surfing
C. Both “surfing” and “to surf”
D. surf

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On, At, ByPresent Simple Tense PassivePresent Perfect SimplePronouns and QuantifiersConditionals (0 - 1 - 2)Conditional SentenceConjunctions and Sequence ConnectorsPresent / Future / Present Progressive / non Action VerbsConjunctions, Prepositions and InterjectionsNoun, Verb, AdjectiveOther quiz:
Grammar › ViewI can’t type because my cat ___ on my keyboard.
A. am sleeping
B. is sleeping
C. was sleeping
D. were sleeping
Grammar › View
Tom is looking for ______ English book.
A. her
B. his
C. my