Yes, you will hear it said both ways. Some people think that the insertion of it/that makes the structure more logical, but I don't really think it does.
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moon72961. But just because elephants having four legs doesn't mean they use them in the same way as other four-legged animals.2. But just because elephants have four legs, it doesn't mean they use them in the same way as other four-legged animals.#2 is possible; #1 isn't.