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--how long have you been here in sydney?--____last wednesday

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--how long have you been here in sydney?--____last wednesday.i___two days before you.
A.since ,arrived B.since,went
选A但是不知道怎么区分A和B,麻烦讲解,
--how long have you been here in sydney?--____last wednesday
since arrive 后面都可跟表示时间段的时间状语.题中 since last wednesday表示从上周三到现在这段时间;I arrived two days before you .我已经比你早到了两天了.
而go 是瞬间动词,跟表示时间点的时间状语,如I went at 8 o'clock.