【单选题】As soon as _____ concert film 'This Is It' was released on October 28th, it became _____ great success in all big cinemas across the planet. [ ]
【单选题】The celebration of Valentine's Day became unfashionable in the ______ century.
【单选题】19阀控式液压舵机中,一般不使用______。
【单选题】Which of the following sounds more informal and more natural?
【单选题】Which sentence sounds more professional?
A.
“How may I assist you today?”
C.
“What do you need, sir?”