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题型：单选题题类：常考题难易度：普通

仁爱科普版九年级上Unit 1 The Changing WorldTopic 1 Our country has developed rapidly. 语法专题练习：现在完成时

China a lot since 1978.

A、changed B、has changed C、was changed D、 is changing

举一反三

—Why are you standing here, Mrs. White?
—I'm waiting for my son. He _________ back from school.

How time flies ! Several years _____ since we last met at Jack's Party.

—Candy, I'm sorry to have kept you waiting so long.

—Never mind. I here for only a few minutes.

— Did you buy the book Becoming by Michelle Obama?

—Yes. I __________ it since it came out. This is a best-seller.

事实上，杰克以前从未来过这儿

It been 2 years since he came here.

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