◎ 题干
-It's difficult 'for the village children to cross the river for school.
-I think a bridge _________ over the river 
[     ]
A. should be built      
B. is being built
C. has been built        
D. was built
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“-It's difficult 'for the village children to cross the river for school. -I think a bridge _________ over the river [ ]A. should be built B. is being builtC…”主要考查了你对  【情态动词】【被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。