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The machine has been made easier for it __________.

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The machine has been made easier for it __________.
A to operate.B.operated.C.being operated.D.To be operated
为什么是D呢?.be+ adj.+to do.并且主动表被动,
这样理解比较简单:
1.The machine is easy to operate.
2.The machine has been made easier for it (指machine.是被操作的) to be operated (被动)
3.The machine has been made easier for people (人.操作) to operate..(主动)