―I'm thinking of the CCTV English Competition next week.I'm afraid I can't do very well.― ______________________ I'm sure you'll make it.A.All right B.Good luck C.Well done D.Cheer upcheer up 是不是一定要在别人失败后才能用?

―I'm thinking of the CCTV English Competition next week.I'm afraid I can't do very well.― ______________________ I'm sure you'll make it.A.All right B.Good luck C.Well done D.Cheer upcheer up 是不是一定要在别人失败后才能用?
―I'm thinking of the CCTV English Competition next week.I'm afraid I can't do very
well.
― ______________________ I'm sure you'll make it.
A.All right B.Good luck C.Well done D.Cheer up
cheer up 是不是一定要在别人失败后才能用?

―I'm thinking of the CCTV English Competition next week.I'm afraid I can't do very well.― ______________________ I'm sure you'll make it.A.All right B.Good luck C.Well done D.Cheer upcheer up 是不是一定要在别人失败后才能用?
这道题翻译而来大意是：
-我正在想下周的CCTV英语竞赛.我担心我不能做的很好.
-（）.我确信你能过.
A项意思为正确的.B项是祝你好运.C项是做得好.D项是振作起来.
由句意可知该题应选D.
cheer up有两种用法.
1）做及物动词时,意思是“使...高兴/振奋起来”,宾语一般是sb/oneself
如：You should cheer him/yourself up.
2）做不及物动词时,意思是“（自己）高兴/振奋起来”,此时无宾语,不用被动语态
如：Hearing the good news,I cheered up.
至于用在什么地方就要具体地根据题意判断了.