[ Dependent Preposition ]
The doctors had to operate ____ his knee after the injury.
A. on
B. at
C. in
D. for
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Vocabulary and ModalsSimple Past/Past ProgressivePresent and Past TensesPresent Continuous TenseModal RequestsNouns & PronounsVerb PatternsGrammar and Sentence StructurePresent Perfect and Past Simple
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Tag Questions › ViewI’ll have to pay that again, _______?
A. haven’t I
B. have I
C. won’t I
D. will I
E. don’t I
Grammar › View
She ________ for next the semester.
A. didn´t regIster
B. registering
C. are registered
D. not registered
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