she was able to give the police a full account of since she had been ___to it.选哪个?

she was able to give the police a full account of since she had been ___to it.选哪个?
A:an observer
B:a witness
英语人气:729 ℃时间:2020-01-04 00:24:07
优质解答
B:a witness目击证人为什么答案是A呢?an observer观察者我知道那是神马意思,我想知道为什么答案选A
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