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题型：单选题题类：模拟题难易度：普通

Tony knows China very well because he ______ in China for twenty years.

A、works B、was working C、will work D、has worked

举一反三

So far, we ________ English for three years.

—What a nice watch! How long ________ you ________ it?

—For just two weeks.

— Doctor, I caught a bad cold, and I have a sore throat now.

— How long __________ like this?

— How long have you been teaching in this school?

— __________ 1993.

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

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