keep it up保持優秀成績；繼續幹下去；乾得好
拓展：
(1)keep up不落後；維持，保持，使(鬥志等)不低落
keep up with跟上……；向……看齊
(2)keep相關短語
keep a close/careful watch on 密切注意/監視
keep an eye on 留神；照看
keep away from (使)避開，不接近
keep a record保持記錄
keep sth.in mind把……記在心裡
keep off 使不接近，使避免
keep on 繼續，持續
keep...out of 擋住，使進不去；不惹事
例句
I've been working twelve hours a day，but I shall not be able to keep it up.
我一直是每天工作12個小時，不過我再也堅持不住了。
We're on a winning streak—hopefully we can keep it up.
近來我們連連獲勝，但願能夠再接再厲。
Her illness kept her away from work for several weeks.
她病得好幾周都上不了班。
We must keep the enemy out of the country.
我們必須禦敵於國門之外。
【連結訓練】
If we can ________ this speed，we should arrive there in about two days.
A．keep up
B．keep on
C．keep to
D．keep with
【解析】 keep up意為「保持」；keep on doing sth.意為「持續做某事」；keep to「遵守(諾言)，堅持」。
【答案】 A
As a senior 3 students，if you want to get a good result，It's important to ________a good state of mind for the coming national entrance examination.
A．keep up
B．carry out
C．keep off
D．keep out
【解析】 句意為：作為一名高三的學生，如果想取得好的成績，保持一個好的狀態對即將到來的高考是很重要的。keep up意為「保持」，符合題意。carry out「執行」；keep off「遠離」；keep out「使不進入」。均不符合題意。
【答案】 A