________ is stronger than steel and lighter than a feather is the silk ________ spiders make their webs.
A.That; that | B.Which; for which | C.What; what | D.What; with which |
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________ is stronger than steel and lighter than a feather is the silk ________ spiders make their webs.
A.That; that | B.Which; for which | C.What; what | D.What; with which |