Influenza (travels) exactly as (fastly) as man. In oxcart days (its) progress was (slow).

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问题 Influenza (travels) exactly as (fastly) as man. In oxcart days (its) progress was (slow).

选项 A、travels
B、fastly
C、its
D、slow

答案B

解析 fast本身就可以用作副词。改“fastly”为“fast”。
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