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
人气：476 ℃ 时间：2020-03-28 16:44:10
解答
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
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