This machine need__(check) once a year这题怎么填啊

This machine need__(check) once a year这题怎么填啊 This machine needs _____ once a year in order to work proper This machine needs______once a year in order to work properl once a year啊,once是什么词性, spring festival ( )this year.怎么填? Ladies and gentlemen,I return to this year in a time machine Automatically check for updates once a once half year,twice a year 用once a year造句 Miss Wang teaches __(they)Chiness this year 怎么填 This isthe school___we visited a year ago这句定语从句填什么? The machine writes words ,and this is a ( ) machine