___________ once every two years,whether it is a casr,a bus or a lorry,is the rule that all drivers must obey in our country.A.Having been examined B.Examined C.Examining D Being examined选哪个,为何?

We took the boy to the ___________(安全) at once. How often ___________ you _________(phone) your parents?---Once a week once! once once Once once Once once once once eve怎么样 eve是什么意思? eve-是什么意思 Eve是什么意思? eve是谁 Eve是什么意思? eve是什么