[ Past Tenses ]
I was very tired when I arrived home. I _______________ hard alll day.
A. worked
B. had been working
C. had worked
D. was working
Select your answer:
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A. was
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Carbon dioxide and black carbon, or ______, are two of the most dangerous air pollutants.
A. soot
B. mould
C. mildew
D. asthma