[ Perfect Tenses ]
My back hurts because I … here for three hours.
A. was standing
B. have stood
C. have been standing
D. had been standing

Random Topics:
Relative Clauses and etcPersonal PronounQuantifies and Modals of DeductionSimple PastVerb, Object, PrepositionSports VocabularyModal Verbs and Gender NounsGrammar Past and Future TenseGerundSuperlative AdjectivesOther quiz:
Subject Verb Agreement › ViewRecycling and composting ________ the amount of waste that ends up in landfills.
A. reduce
B. reduces
Tenses › View
Distinguish the usage of simple future tense: I (will go/am going) to the concert tomorrow.
A. went
B. will go
C. am going to
D. goes
Grammar › ViewIdentify the adjective in the sentence:
The ball is so big.
A. ball
B. is
C. big
Plural › View
What’s the plural of wolf?
A. Wolfs
B. Wolfes
C. Wolves
