several times前用什么时态

several times前用什么时态 several times前的时态?比如He _____failed the test several times. in several years用什么时态 several times用什么替换比较好several times用a number of times 替换好还是用 three times 替换好 英语时态.he has come here several times.为啥不对? several times already前用什么时态 many times 用于什么时态 he什么(be)to　shanghai　several　times some times和several times有什么区别啊? for several years 用于什么时态 several days ago与什么时态连用 several times 用only a few times 替换可以吗/ I have seen her several times.和I saw her several times.什么区别 since前用什么时态,后用什么时态 for three year前用什么时态 a few times与什么时态连用? a few times与什么时态连用