单选题
公共英语一级
2012-06-27
He knew no thing about it__________his friend told him．
A．until
B．because
C．if
参考答案
A
答案解析
考查连词。until经常与否定词连用，构成not(...)until搭配，表示“直到...(才...)”。本题中nothing是否定词，相当于not。because指“因为”，if指“如果”，都不符合句意逻辑。
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