公共英语一级
单选题[A]once
[B]even
[C]ever
[B]even
[C]ever
参考答案：C进入在线模考
[c]。考查副词。0nce曾经，--J变；even甚至；ever从来，总是。三个选项中只有ever可用在before前，构成ever before这一搭配，指“以前从来…”。
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