作业帮be hard后加to do 还是加doing
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be hard后加to do 还是加doing
be hard后加to do 还是加doing
be hard后加to do 还是加doing
be hard后加to do 还是加doing
解析：It+be 形容词+to+动词原形+其它成分.
be hard后应该加to do
hard to do
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