1-.It must have been hard word.

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1-.It must have been hard word.
-Yes,it_____Dr.Yuan more than 20 years to develop the super hybrid rice.
A.takes B.has taken C.was taking D.took
2.--Did you go to Mrs.Smith's birthday party?
--Of course.Every boy and every girl in our class______.
A.has been invited B.have been invited C.was invited D.were invited

1 it takes sb sometime/sth. to do sth. 做某事花费某人……it 做的是形式主语.
2. every +名词单数+every +名词单数做主语时,谓语动词用单数.我们班里的每个男孩和女孩都已经被邀请.

must have working hard与must have been working hard的区别 It Must Have Been Love 歌词 It Must Have Been Love (Cologne) 歌词关于must have been MUST have been done must have been 英语翻译‘It must have been a formidable child,’ Rickword writes, It must have been so though for you,huh? I must have been a great _____ to my parents in those hard d must have/ must have been的区别 must have been done must have done It must have been they who picked the flowers.这里的强调句的must ha