--------where ( ) john ( ---------to the library.he ( )there for an hour.has\been\has gone,has \gone\has been,did \go\went,did\be\went 为什么选b

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--------where ( ) john ( ---------to the library.he ( )there for an hour.
has\been\has gone,has \gone\has been,did \go\went,did\be\went 为什么选b

最后一个空因为状语是一段时间for an hour,所以要用延续性的动词,只能是has been,他已经在那儿一个小时了.前面两个空has gone意思是约翰去了哪儿

has gone,has been