[ Tenses ]
He gave us warning to stay away from the machine while it __________.
A. had worked
B. was working
C. would work
D. would be working

Random Topics:
Auxiliary VerbsContrast Linking WordsPresent Simple, Present Continuous or Present PerfectWord FormationOpinion / AgreementPresent Perfect and Present Perfect ContinuousPresent Perfect vs Past Simple TenseSocial Media VocabularyAdverb of MannerPresent Tense (Negatives and Questions)Other quiz:
Mixed General Quiz › ViewArizona was once thought to be an ___ worthless desert.
a. almost
b. all most
c. already
d. all ready
Grammar › View
Yonny … my birthday.
A. always forgets
B. always is forgetting
C. forgets always
Vocabulary › Viewpersistent in effort; stubbornly
A. resemblance
B. imploringly
C. radiate
D. doggedly
Tenses › View
I ______ to New York three times this year.
A. have been
B. was
C. were
D. had been
