[ Grammar ]
The students were tired. They … hard all the morning.
A. Worked
B. Had been working
C. Have been working
D. Had worked

Random Topics:
Continuous TenseGrammar-Present Continuous-Sentence MakingGrammar (want to/ need to/ have to)Types of Sentence StructureGrammar and Sentence StructurePast Perfect vs Past SimpleModals of Advicegoing toGrammar for TOEFLPast or Present Verb TenseOther quiz:
Countable & Uncountable Nouns › ViewThere are __________ seats in the hall.
A. a little
B. many
Grammar › View
She ——————– with her parents.
A. live
B. lives
C. living