定语从句连接词必须用that的情况答:在下列情况中,只能用 that,不用 which:①当先行词是 all, a lot, (a) little, few, much, none, anything, something, everything, nothing 等词时。如:All that can be done has been done.In this factory I saw little / much that was different from ours.②当先行词被 all, ...