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it is one of the important problems ()tomorrow

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it is one of the important problems ()tomorrow
A to solve B to be solved C solved D solving
it is one of the important problems ()tomorrow
不一样.这个很简单,只要这个动作是主语做,就用to do,否则就是to be done.
前者,动作发出这是主语,所以主动代替被动.
例如:I have homework to do(我将自己完成作业)
I have hoomework to be done(哈哈~我要别人帮我完成呀!)
看看这就是区别