[ Tenses ]
Erika.…on her report for three days in a row without much sleep. That’s why she looks so tired.
A. Works
B. Is working
C. Has been working
D. Was working
E. Had been working

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Modal Verbs of ObligationGrammar - Present Perfect with for and sinceRegular and Irregular VerbsCohesive DevicesSimple and Continuous TensesPrepositions of Time and PlacePast Simple or Past ContinuousArticles A and AnPast, Present, FutureRelative - ConditionalOther quiz:
Grammar › ViewCan I borrow your scissors? Mine _____ sharp enough.
A. isn’t
B. aren’t
Articles › View
Everyday I wake up at 6 in ___ morning.
A. a
B. an
C. the
D. –
Grammar › View Cubism,________is an artistic technique, was invented by both Picasso and Georges Braque.
A. that
B. which
C. who
D. whose
Grammar › View
I ___ very hard.
A. work
B. works
