2. 外语
  3. Fibers of hair and wool are not continuous and must normally be spun into thread ______ woven into textile fabrics.

Fibers of hair and wool are not continuous and must normally be spun into thread ______ woven into textile fabrics.

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问题 Fibers of hair and wool are not continuous and must normally be spun into thread ______ woven into textile fabrics.
选项 A、as are they
B、when to be
C、that they are
D、if they are to be
答案D
解析 be to表示将来。
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