这是什么从句?that做什么成分?It has been estimated that if the bridge were packed with cars,it would still only be carrying a third of its total capacity.
问题描述：
这是什么从句?that做什么成分?
It has been estimated that if the bridge were packed with cars,it would still only be carrying a third of its total capacity.
答
宾语从句，that就是个引导词，不做成分~
答
that 引导的是主语从句，因为太长所以放在了后面，然后用it充当形式主语。正常语序应该是：
that if the bridge were packed with cars, it would still only be carrying a third of its total capacity has been estimated.
答
主语从句， that 不做成分
答
主语从句 It是形式主语 that从句是真正的主语
答
that 引导的是主语从句,因为太长所以放在了后面,然后用it充当形式主语.正常语序应该是：
that if the bridge were packed with cars,it would still only be carrying a third of its total capacity has been estimated.
答
主语从句
答
主语从句。that作连接代词。