Fibers of hair and wool are not continuous and must normally be spun into thread _________woven into textle fabrics.
b.when to be
d.if they are to be
为什么b不能看成是省略了主系的壮语从句。
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b改成“when”就对了,相当于when they are woven into.....
用“when to be”好像句意不对,to be该是目的吧,这里是同时发生。
解释的详细准确啊:)
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