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1:How long do you think_______he_________the computer?

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1:How long do you think_______he_________the computer?
A:/ ;bought B:has;had C:did;buy D:/;has had
2:The two friends were______pleased to see each other that they forgot everything.
A:so B:too C:very D:much
3:The country life he was used to _________greatly since 1992.
A:change B:has changed C:changing D:have changed
请选择?为什么?
1B...do you think是拆入语,用现在完成时
2B...too...to太...太.
3B...主语是The country life ,还有since 1992.用现在完成时