Although they were tired, they continued to work late into the night.

A. Tired as they be, they continued to work late into the night.
B. No matter how tired they were, they continued to work late into the night.
C. However they were tired, they continued to work late into the night.
D. Though tired as they were, they continued to work late into the night.

Đáp án đúng: B

- Đáp án A sai vì “be” => “were”
- Đáp án B: cấu trúc: No matter how + adj/adv + S1 + V1, S2 + V2: dù như thế nào...thì...
- Đáp án C sai cấu trúc đảo với “however”: However + adj/adv + S1 + V1, S2 + V2
- Đáp án D sai vì thừa “though”
Tạm dịch: Dù họ mệt nhưng họ vẫn tiếp tục làm việc muộn cho tới tận đêm.

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