[ Tenses ]
Which sentence is in the past perfect continuous tense?
A. He has been cooking for an hour.
B. They had been cooking for an hour when we arrived.
C. I cooked dinner yesterday.
D. We will cook dinner tomorrow.

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Which of this sentences is the correct:
A. Black bears are beautiful, they have shiny coats.
B. Black bears are beautiful. They have shiny coats.
C. Black bears are beautiful. they have shiny coats.
