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一个英语选择题,急Fibers of hair and wool are not continuous and must

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一个英语选择题,急
Fibers of hair and wool are not continuous and must normally be spun into thread ________ woven into textile fabrics.
A.when to be B.if they are to be
帮我分析下 我怎么觉得两个都对呀?
有遇到一个问题了
She is as plain as her mother is beautiful.
此语看不懂
as ...as 的什么用法?
只知道应该表示比较的
我也是选那个的
但是错了 陈汉生上的答案是B
一个英语选择题,急Fibers of hair and wool are not continuous and must
as +形容词+ as
否定时还可以用SO+形容词+ AS
同级比较
至于选B
就是这个句型是宾语从句.而从句部分是一般疑问句所以用if连用所以选B