[ Grammar ]
Carlos _________ _________ ___________ all day, so he had a headache.
A. had worked
B. was working
C. has been working
D. had been working

Random Topics:
Modals of Speculation and DeductionAction vs Linking Verbs/ Verb PhrasesIdentifying TensesDependent PrepositionsTime and CalendarPast Tense vs Future TenseAdverb of MannerIrregular AdjectivesTOEFL GrammarApologizingOther quiz:
Grammar & Vocabulary › ViewDo you usually ______ time with your family or friends at the weekend?
A. start
B. change
C. spend
Mixed General Quiz › View
There are many differences ___ the four countries.
a. between
b. of
Mr. Monahan is a dad.
In this sentence, what is the word “dad”?
A. Object of the preposition
B. direct object
C. predicate noun
D. indirect object
Grammar › View
How old are you?
A. She’s 21.
B. I’m 21