－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

税赋增加会导致社会投资减少，各行业的盈利能力降低，会使居民和企业转向投资发展不动产，以房地产升值来获取更大利润，导致土地需求增加，土地价格上升。( )