Until the 16th century the earth______to be flat.A、is believedB、has been believ

游客2025-03-20 25

问题 Until the 16th century the earth______to be flat.

选项 A、is believed
B、has been believed
C、believed
D、was believed

答案 D

解析 until the 16th century指的是过去，故只能选D。

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