1.Great changes _ _ _in China in recent years(发生)2.We should _ _ _to control the population(采取一些措施)3._of the students_ girls in our classA.One fifth;are B.One fifth;is C.First fifth;are4.-I have ever been to Beijing.- _A.So have

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1.Great changes _ _ _in China in recent years(发生)2.We should _ _ _to control the population(采取一些措施)3._of the students_ girls in our classA.One fifth;are B.One fifth;is C.First fifth;are4.-I have ever been to Beijing.- _A.So have

1.Great changes _ _ _in China in recent years(发生)2.We should _ _ _to control the population(采取一些措施)3._of the students_ girls in our classA.One fifth;are B.One fifth;is C.First fifth;are4.-I have ever been to Beijing.- _A.So have
1.Great changes _ _ _in China in recent years(发生)
2.We should _ _ _to control the population(采取一些措施)
3._of the students_ girls in our class
A.One fifth;are B.One fifth;is C.First fifth;are
4.-I have ever been to Beijing.- _
A.So have I B.So I have C.Neither have I

1.Great changes _ _ _in China in recent years(发生)2.We should _ _ _to control the population(采取一些措施)3._of the students_ girls in our classA.One fifth;are B.One fifth;is C.First fifth;are4.-I have ever been to Beijing.- _A.So have
1.have been happened
2.take some measures
3.A
4.A

1.took place
2.take action
3.A
4.C

1.have taken place
2.take some actions
3.A
4.A