一些语法题提问1.He would take the thief to the police station when

一些语法题提问
1.He would take the thief to the police station when he met him again.
为什么用would和met为什么是过去时呢?
2.On the table is a pile of book which he consults from time to time.
为什么用is.
3.All but one___here just now.
A.is B.was C.has been D.were.
4.The wonded___(has/have)送到医院,是选什么?