Three fourths of the homework has been done today 为什么不用have?

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• 6 help!help!关于英语时态选择题,在此跪求大家了,谢谢谢谢谢谢谢!6.The little boy is dirty from head to foot because he ( ) in the mud all morning.A.has played B.is playing C.has been playing D.was playing答案:CQ:为什么不用过去进行时态表示小男孩整个早上都在玩,那么对于这到题现在完成进行时态has been playing和过去进行时态was playing 有什么区别,用现在完成时态has played 行不喃.又和前两个时态比较喃?现在完成时have done分为两种 1.动作未完成 2.动作已完成 所以理论说 has played 可以表示现在还在玩啊~
• Three fourths of the homework has been done today 为什么不用have?
• three-fourths of the work ___today A has finishethree-fourths of the work ___today A has finished B has been finished C.have been finished 为什么选B分数后面不是应用复数吗 我觉得选c啊
• 答得好加悬赏1.There is ____(a/an)"s"in the word "desk"请说明如何区分元音单词 2.we spend an hour finishing _____(the/不填)说明原因3.____(that ,this)is all i wanted to say 说明理由4.I' m afraid get an injection is ____(much too;a lot )原因5.He returned ____(at /on)a rainy night 正确答案是at.但是不是说具体的一天用On 6.解释下括号里为什么用这个时态She always (studied)something whenever she(played)7.-has Tom finished his homework today?-I have no idea .He (was doing )it this morning 括号里为什么不用现在完成时?8.They were (frigh
• Three-fourths of the homework [ ]today.A;has finishedB;has been finishedC;have finishedD;have been finished必须有理由
• Has all that can be done been done?为什么用HAS 不用 HAVE PEOPLE也是整体,动词用复数先换成陈述句＝all that can be done has been done主语＝all 定语＝that can be done谓语＝has been done（被动）转换成简单的主句＝all has been doneall 作为一个整体,集合名词所以用单数我的意思是为什么用HAS 不用 HAVE PEOPLE也是整体，动词用复数 that为主语的话，无论that指的是单数还是复数，谓语动词都要用单数？
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• Three fourths of the homework has been done today 为什么不用have?
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