问题描述:
-- it's difficult tp get to the other side of the river -- l think a bridge --- over the river
a\ should be built
b\ should build
c\ will build
d\ has built
请您说明理由好吗?
a\ should be built
b\ should build
c\ will build
d\ has built
请您说明理由好吗?
问题解答:
我来补答展开全文阅读