A. We began to cook for the party for four hours.
B. We have been cooking for the party for four hours.
C. We cooked for the party for four hours.
D. We cooked for the party four hours ago.
B
We started cooking for the party four hours ago.
= We have been cooking for the party for four hours.
four hours ago ⇒ for four hours
started cooking ⇒ have been cooking
Dịch: Chúng tôi đã nấu ăn cho bữa tiệc trong bốn giờ.
Chọn đáp án B.
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