Gteat changea_____(happen)in china in last twenty years.Tom____(make)a lot of friends since he came to china last year.填上适当的形式

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Gteat changea_____(happen)in china in last twenty years.Tom____(make)a lot of friends since he came to china last year.填上适当的形式
Gteat changea_____(happen)in china in last twenty years.
Tom____(make)a lot of friends since he came to china last year.
填上适当的形式

Gteat changea_____(happen)in china in last twenty years.Tom____(make)a lot of friends since he came to china last year.填上适当的形式
have happened(因为有in last twenty years,用完成时)
made(有last year,用过去式)

1 has happened
2 has made

1.Great changes have happened ....
2.made

have happened
made