Two new bridges ______ on the river by the end of next year.

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问题 Two new bridges ______ on the river by the end of next year.

选项 A、will be built
B、will have been built
C、are going to be built
D、have been built

答案B

解析 动词时态。根据关键词by the end of this year可知,本题需用将来完成时,其结构为will+have done,表示到将来某时某事已发生。[例句] By this time next week we will have been married l5 years.到下星期这个时候我们就已结婚15周年了。
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