Nylon ……………………in the 1930s.
A. invented
B. was invented
C. is invented
D. has been invented
Giải bởi Vietjack
Đáp án B
Giải thích: in the 1930s là mốc thời gian đã qua nên câuchia quá khứ. Nylon không thể tự làm ra nó nên ta chia bị động.
Dịch: Nylon được làm vào những năm 30.
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