Câu hỏi:
We should reuse old items _____ we throw them out.
A. when
B. until
C. before
Trả lời:
Đáp án: C
Giải thích: before = trước khi
Dịch: Chúng ta nên tái sử dụng những món đồ cũ trước khi vứt chúng đi.
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Câu 2:
Choose the underlined part among A, B, C or D that needs correcting.
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