[ Present Perfect Continuous ]
The machines _____ working today.
A. don’t
B. aren’t
C. isn’t
D. not
Select your answer:
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Present Tense (Negatives and Questions)Modal and Phrasal VerbsQuantifiersAdverb of ConcessionPerfect Verb TensesTensesRelative & Interrogative PronounsAdjectives & PrepositionsSo / Neither / Either / Too
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A. chase
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