You can make different kinds of ice-cream by( )[use]this machine.You can make different kinds of ice-cream by( )[use]this machine.

问题描述:

You can make different kinds of ice-cream by( )[use]this machine.
You can make different kinds of ice-cream by( )[use]this machine.

using因为前面by是个介词,所以后面是动词ing形式