long ago,people used stones_____a fire a.for making b.to making c.made d.make

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long ago,people used stones_____a fire a.for making b.to making c.made d.make

long ago,people used stones_____a fire a.for making b.to making c.made d.make
long ago,people used stones_____a fire a.for making b.to making c.made d.make

long ago,people used stones_____a fire a.for making b.to making c.made d.make
B used to doing 过去常常,固定搭配

b

B used to doing 现在常常做某事

B