[ 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:
Present Tense › ViewWe _______ help our mother with the housework.
A. helps
B. helping
C. helped
D. help
Grammar › View
Captain Henry, ________ crept slowly through the underbrush.
A. being remote from the enemy
B. attempting to not encounter the enemy
C. not invovling himself in the enemy
D. trying to avoid the enemy
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