has been doing与had been doing,这两个时态分别代表怎样的概念,表示怎样的动作发生,用于何种情况,请大家分别具体解释一下它们所用的场合

had been doing是什么语法?举个例子~有have/has been doing的说法吗? ----Has Tom finished his home work yet?----I have no idea;he[ ] it this morning.A.was doing B.had been doing C.had done D.did He ___ his lessons from seven to nine last night .A.did B.had gone C.was doing D.has been doing(带句子翻译, 1.在句子中什么时候使用副词?2.在英语中,什么时候用had been doing had done has been doing has done请分别举例, 1.在英语中,什么时候用had been doing 2.在句子中什么时候使用副词?had done has been doing has done had been doing 是什么时态? had been doing是什么时态 had been doing是什么时态 —Has Tommy finished his homework yet?—I have no idea; he ---it this morning.A.was doing B.had been doing C.has done D.did 选A 还是B 是最好的答案 has been doing与had been doing,这两个时态分别代表怎样的概念,表示怎样的动作发生,用于何种情况,请大家分别具体解释一下它们所用的场合 What did Michael do after graduating from university?—He considered advertising before settling on teaching．He ____ that ever sinceA．did B．does C．has been doing D．had been doing 47.She ______ up for two hours.A.has got B.has been C.has been got D.had been has been doing have been done区别 292.The film ______for five minutes.A.has begun B.had begun C.has been on D.had been on The meeting ___when I got there.A has begun B has been on C had begun D had been on Mr.Smith is not at home.He___to work.A.has gone B.has been C.had been D.had gone when I got to Birds Nets,the game___.A,had started B.has been C.had been D.has began had been doing 和had been done有什么差别