-How long has Eliza been a nurse?-_A.Since 2004,B.Four years

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-How long has Eliza been a nurse?-_A.Since 2004,B.Four years ago C.In 2004D.Since four years

A
since+过去的时间点,表示一段时间（从这个时间点到现在的这一段时间）
B项错在：four years ago是过去的一个时间点,只能用于回答when,而问句问的是how long,这要求用一段时间来回答.
C项错在：in 2004是过去的时间,只能用于回答when,不能回答how long.
D项错在：since不能接一段时间.如果since改成for就可以了.
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