It's good for you to keep_____when something difficult needs___.A trying;to do B trying;doingC to try;to doD to try;to be done

It's good for you to keep_____when something difficult needs___.A trying;to do B trying;doingC to try;to doD to try;to be done
It's good for you to keep_____when something difficult needs___.A trying;to do B trying;doing
C to try;to do
D to try;to be done

It's good for you to keep_____when something difficult needs___.A trying;to do B trying;doingC to try;to doD to try;to be done
选B.keep doing坚持做某事；
sth.needs doing 某物需要...,动名词doing是主动形式表示被动意思.
也可用：sth.needs to be done

答案选B
keep后面跟动名词：keep doing ，表示不停的做某事。
所以排除CD
difficult后面是后置定语。
翻译过来：一些需要被解决的困难。
困难只能被解决，而不能自动解决，所以用被动，有两个都可以：to be done或者是动名词doing
因为排除CD，AB当中没有to be done ，只有doing ，所以选B。
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答案选B
keep后面跟动名词：keep doing ，表示不停的做某事。
所以排除CD
difficult后面是后置定语。
翻译过来：一些需要被解决的困难。
困难只能被解决，而不能自动解决，所以用被动，有两个都可以：to be done或者是动名词doing
因为排除CD，AB当中没有to be done ，只有doing ，所以选B。
希望有所帮助。
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B
keep doing
need to do 指某人需要做什么事情，句子的主语是人；
need doing 指某物需要怎么处理，句子的主语是物。
注意：当主语是物时，need doing 也可用need to be done 替换

我觉得应该选B。