1.Please be quiet.the kids have (fall)asleep.2.Thd dirty water in this river ma...1.Please be quiet.the kids have (fall)asleep.2.Thd dirty water in this river many problems in the past five years.a.creates b.is creating c.has created d.was creating
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1.Please be quiet.the kids have (fall)asleep.2.Thd dirty water in this river ma...1.Please be quiet.the kids have (fall)asleep.2.Thd dirty water in this river many problems in the past five years.a.creates b.is creating c.has created d.was creating
1.Please be quiet.the kids have (fall)asleep.2.Thd dirty water in this river ma...
1.Please be quiet.the kids have (fall)asleep.
2.Thd dirty water in this river many problems in the past five years.a.creates b.is creating c.has created d.was creating
1.Please be quiet.the kids have (fall)asleep.2.Thd dirty water in this river ma...1.Please be quiet.the kids have (fall)asleep.2.Thd dirty water in this river many problems in the past five years.a.creates b.is creating c.has created d.was creating
fallen; C
1.fallen
2.C.has created
祝你进步
1.fallen
2.C
in the past five years. 在过去的五年中，是一段时间，用于现在完成时。
希望能帮到你，祝你开心。
1.Please be quiet.the kids have fallen (fall)asleep.
2.Thd dirty water in this river has created many problems in the past five years. a.creates b.is creating c.has created d.was creating
fallen ： fall，fell（过去时），fallen（完成时）
has created ：这是完成时，表示动作已经完成，已经造成了许多问题