[ Grammar ]
What is the contraction for does not?
A. doesn’t
B. doesnt’
C. doen’t
D. does’nt

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IELTS Vocabulary › ViewIf something such as a machine or an industry has zero emissions, it does not release any harmful substances into the atmosphere.
A. estimate the cost
B. zero emissions
C. harness energy
D. renewable energy
Past Tenses › View
In which tense do we often use expressions like “by the time” and “already”?
A. Past Simple
B. Past Continuous
C. Past Perfect Simple
D. Past Perfect Continuous