A brings something to B 表示A給B帶來了某物.
它用when的問句就是when does A bring something to
（A什么時(shí)候給B帶某物來?）
如果用were,應(yīng)該是Something were brought to B,是被動(dòng)語氣,表示某物被帶來給B.
在這句話,如果填Were表被動(dòng),至少應(yīng)該是When were it brought to us?（它什么時(shí)候被帶來給我們?）或者When were you brought to us?（你什么時(shí)候被帶來給我們?——語法對(duì),句意不通）.但后面有了it,說明這句話不是被動(dòng),所以要填主動(dòng)的did.
when did you bring it to us
when did you bring it to us
為什么用did
不用were?
when were you brought it to us
為什么用did
不用were?
when were you brought it to us
英語人氣：275 ℃時(shí)間：2020-02-06 09:24:26
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