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Although the "that" and "which" are objective in the following sentences, why the writer has mentioned them?
Students of general English will not have such specific needs, of course, and so their lessons and the materials which the teachers use will almost look different from those for students with more clearly identifiable needs.
And
During the war, people would eat all kinds of things that we don't eat now.
Because they could. In the first case, the writer almost certainly thought the sentence was clearer with which than it would have been without. In the second, probably just personal choice.
