题型：单选题题类：常考题难易度：普通

鲁教版（五四制）初中英语九年级Unit 8 Period 3 Section A & Section B

There ________________ great changes in such kind of PDAs (掌上电脑) in the last few years.

A、has been B、have been C、has had D、have had

举一反三

—No, I___________ it for one year.

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