英语专业四级语法专题时态语态I. 比较活跃的时态 1. 现在完成时 _ conscious of my moral obligations as a citizen. A. I was and always will be B. I have to be and always will be C. I had been and always will be D. I have been and always will be Which of the following words can NOT be used to complete “Weve seen the film _”? A. before B. recently C. lately D. yet现在完成时V.S. 现在完成进行时 1 ）现在完成时表示动作已经结束，现在完成进行时表示动作还在延续。 2 ）现在完成时表示动作已经一次性完成，而现在完成进行时则表示动作的反复发生。 Jack _ from home for two days now, and I am beginning to worry about his sa
