The doctors had to operate ____ his knee after the injury.
A. on
B. at
C. in
D. for

Random Topics:
PunctuationPrepositions and ConjunctionsPast Simple - Present PerfectNoun PhrasePast Perfect Tense and Past TenseDefinite and Indefinite ArticleApologizingThe Past SimpleConjunction: Because and SoGrammar: Simple Past and Past ContinuousOther quiz:
Conditional Sentences › ViewThanks to your support, I was able to complete the task successfully.
A. If you hadn’t supported me, I would not have been able to complete the task successfully.
B. If you hadn’t supported me, I can’t have completed the task successfully.
C. Had it not been for your support, I could have completed the task successfully.
D. If you had supported me, I would have been able to complete the task successfully.
Homonyms › View
Let there be ___ on Earth and let it begin with me.
a. peace
b. piece
My Mum was very busy at work, but she _____ take a short holiday over Christmas.
A. should
B. was able to
Grammar › View
Choose the appropriate demonstrative pronoun: “Look at _ clouds in the distance.”
A. this
B. that
C. these
D. those
