句子中为什么有 a?China will keep a close eye on the development of

句子中为什么有 a?China will keep a close eye on the development of 英语翻译If you keep a close eye on Cisco’s UCS server strategy,y With the rapid development of China's economy,close ___shoul 翻译 We’ll also keep a close eye we should look at a person with the eye of development I'll keep ______ eye on the baby when she is away.A：the B：on keep a strict eye 这句话怎么翻译啊?Keep your eye on those in need of a stronger umbrel there will be a talk ___ the history of china tomorrow .a on keep an eye on the I'll keep ______ eye on the baby when she is away. A：the B：o the eye of a hurricane