C.used to generate
D.used to generating
答案:①A ②A
4.keep it up再接再厉
keep it up;continue doing or trying不松劲,坚持下去。在这个短语中,it本身词义模糊,只是帮助构成习语。
If only he could keep it up,he would break the world record.
只要他坚持不懈,他就能够打破世界纪录。
Keep it up;don't stop it!继续下去,不要停止!
●用法拓展
keep up使不落下;不衰退;继续保持;使某人不睡觉
keep sth. up(使)照顾好并保持良好情况
keep up one's courage鼓起勇气
keep up one's spirits保持精神高昂
keep up old customs遵守古老的风俗
Will the fine weather keep up?
这好天气会继续下去吗?
How much does it cost you to keep up your large house and garden?
维护你的大房子和花园需要多少花费?
I do hope we're not keeping you up.
我希望我们没有耽误你睡觉。
They entered into a correspondence which was kept up for almost 10 years.
他们开始通信,并且这种联系保持了10年之久。
●用法拓展
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