Not until Columbus discovered America______to Europe.

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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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