A. Paper is believed to have been invented by Chinese people
B. Paper is believed to be invented by Chinese people
C. It was believed that Chinese people invent paper
D. Chinese people are believed to invent paper
A
Active: People/ They + think/ say/ suppose/ believe/ consider/ report ... + THAT + clause (simple present/ simple past or present perfect)
Passive 1: IT + tobe + thought/ said/ supposed/ believed/ considered/ reported ... + THAT + clause
Passive 2: S + am/ is/ are + thought/ said/ supposed/ ... + To Vinf (simple present) / To have V.p.p (simple past or present perfect)
=> đáp án A
Tạm dịch: Giấy được cho là đã được người Trung Quốc phát minh ra.
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