by If you don’t feel well, go to bed and rest.
A. In case you feel well, go to bed and rest.
B. Unless you feel well, go to bed and rest.
C. Go to bed and rest in order not to feel well.
D. If you want to feel less well, go to bed and rest.
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Đáp án: B
Giải thích: unless = if…not…
Dịch: Nếu bạn thấy không khoẻ, đi lên giường nghỉ ngơi đi.
