[ Grammar ]
Which of the following sentences contains a comma error?
A. Despite his great hunger, Roger continued his fasting for world peace.
B. The little, old man could hardly stand up due to his painful arthritis.
C. I packed my warm sweaters, long pants, and heavy coat for our trip.
D. While I was working on my homework, there was a bad thunderstorm.

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__________ traveling by plane is fast, its expensive and bad for the environment.
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I saw Lily yesterday. She _______ her police uniform so I ________ her!
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B. was wearing / didn’t recognise
