单选题
Because Internet security is such a dynamic field, systems that are only a year old may ______ be outdated.
(A) already
(B) previously
(C) promptly
(D) lately
A
B
C
D
【正确答案】
A
【答案解析】
[词汇] already已经，早已
[错误答案] (B)以前，预先(C)迅速地，立即地(D)近来
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