[ Grammar ]
I arrived over an hour late to the office and everyone was working. Actually, they (work) for over two hours on the new project and I felt really guilty.
A. were working
B. had worked
C. had been working
D. worked

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The Simple Present TenseArticles & PrepositionDefinite, Indefinite and Zero ArticlesVerb + PrepositionSimple Present VS Present ContinuousPresent Simple and Past ContinuousHave toGoing To Be and WillClause Markers TOEFL GrammarTypes of Simple SentencesOther quiz:
Grammar › ViewThe museum has a jewelry …… .
A. district
B. exhibit
C. destination
Prepositions › View
She wrote a letter of complaint …. the manager.
A. between
B. on
C. of
D. to
