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单选题
Fibers of hair and wool are not continuous and must normally be spun into thread when woven into textile fabrics.
A
as are they
B
when to be
C
that they are
D
if they are to be
参考答案
参考解析
解析：
句意：绒和羊毛不是连续不断的，如果想把它们做成织物，一般要先纺成线。按题意此处应为条件状语从句。A、B两项表示纺线和纺织同时进行，与句意不符。只有D项正确。
句意：绒和羊毛不是连续不断的，如果想把它们做成织物，一般要先纺成线。按题意此处应为条件状语从句。A、B两项表示纺线和纺织同时进行，与句意不符。只有D项正确。
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