[ Mixed General Quiz ]
The income from the oil ___ to support one of the highest standards of living in the world.
a. has used
b. has been used
c. was using
d. was being used
Select your answer:
Random Topics:
Time and CalendarVerb Tenses and GerundsSentence StructureAdverbial Clause of ConcessionComparative and Superlative AdjectivesPast Simple and Past Continuous TensesTypes of Sentence StructureModals of Obligation and PermissionParts of SpeechPreposition FormOther quiz:
Tenses › ViewWhich sentence uses the Future Perfect Tense correctly?
A. They will be leaving the party at midnight.
B. I will be studying for the exam all night.
C. By the time we get home, they will have finished the movie.
D. I am going to finish this book by next week.
Grammar › View
Operant conditioning involves rewarding or punishing certain behave to reinforce or extinguish its occurrence.
A. behave
B. to reinforce
C. or extinguish
D. its occurence