作业帮4道关于完成时的语法题1.the first use of atomic weapons was in 1945,and their power____increased enormously ever since.A.is B.was C.has been D.had been (选D,为什么不是C?）2.He___all his money to the poor people,and from that time he__
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4道关于完成时的语法题1.the first use of atomic weapons was in 1945,and their power____increased enormously ever since.A.is B.was C.has been D.had been (选D,为什么不是C?）2.He___all his money to the poor people,and from that time he__
4道关于完成时的语法题
1.the first use of atomic weapons was in 1945,and their power____increased enormously ever since.
A.is B.was C.has been D.had been (选D,为什么不是C?）
2.He___all his money to the poor people,and from that time he___a happy life.
A.will give;has led B.has given;has led
C.gave;led D.gives;has been leading（选C,为什么不是B?)
3.Cathy is taking notes of the grammatical rules in class at Sunshine School,where she___English for a year.
A.studies B.studied C.is studying D.has been studying(选D,后面有一个for a year所以为什么不是B呢?而且D也应该是has been studied呀?）
4.All morning as she waited for the medical report from the doctor,her nervousness___.
A.has grown B.is grown C.grew D.had grown(选C,为什么不是A?）
4道关于完成时的语法题1.the first use of atomic weapons was in 1945,and their power____increased enormously ever since.A.is B.was C.has been D.had been (选D,为什么不是C?）2.He___all his money to the poor people,and from that time he__
1.事情发生在过去.首先,撇开时态,这句话要用完成时,然后,前面时态是was,那就要用过去完成时.
2.完成时表示从过去到现在一直在做,并且会持续做下去,强调对现在的影响.这句话,是强调他过去做的一件事,并不是一直在做这件事.
3.for a year表示一段时间,说明动作一直持续,所以要用完成时,一般后面跟着时间段,都要用完成时.has been studying 是 be studying 的完成时态,也就是现在完成进行时,been是be的过去分词形式,be doing 不是进行时么.be studied是被动啊
4.这句话就是简单的过去时态.采用排除法,首先过去时,排除A和B,然后这句话没有任何表示时间段的词,所以只是一个简单的过去时.
一般一句话中出现了 since 或者 for +时间段,用完成时