Cartman: We—- the procedures incorrectly. It failed.
Kenny: We——— the procedures incorrectly. I read every step carefully before the experiment and checked each one afterwards.
___
A. could have followed / should have performed
B. can’t have followed / can’t have performed
C. must have followed / can’t have performed
D. may have followed / didn’t need to perform
E. might follow / shouldn’t perform
Random Topics:
PronounPast SimpleSubject Verb Agreement Irregular VerbPrepositions after Verbs and AdjectivePassive Voice Active VoiceConditionals (0 - 1 - 2)Modal RequestsGrammar: Reported QuestionsGrammar and PrepositionsModals of AdviceOther quiz:
Modals of Obligation and Permission › ViewWhen I was a kid, I _____ study every afternoon.
A. have to
B. had to
C. was allowed to
Grammar › View
Before I installed an antivirus software, I…
A. used to steal my password
B. used to have my password stolen
Grammar › ViewWhich word means more than one candy?
A. canes
B. cands
C. candys
D. candies
Modal Verbs › View
Her exam is tomorrow. She ____ finish studying tonight.
A. have to
B. don’t have to
C. must
D. mustn’t