2. 外语
  3. Until the 16th century the earth______to be flat.

Until the 16th century the earth______to be flat.

admin2014-09-24  35
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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