2. 外语
  3. Not until Columbus discovered America______to Europe.

Not until Columbus discovered America______to Europe.

admin2014-08-25  46
问题 Not until Columbus discovered America______to Europe.
选项 A、bananas were brought
B、are bananas brought
C、bananas brought
D、were bananas brought
答案D
解析 否定词出现在句首，要用倒装形式，首先排除A、C。从前半句可以得知本句时态为过去时，所以选D。
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