___________is hard is to do good all one's life and never do anything bad A he B it C that D what

___________is hard is to do good all one's life and never do anything bad A he B it C that D what
为什么不选B 而选D?
英语人气:814 ℃时间:2020-04-04 10:35:32
优质解答
选D
A,C一看就是错的.
选B的话应该是It is hard to do good……多了个is
D是对的.what is hard 是主语
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