河南省栾川三高09-10学年高一上学期期末模拟考试（英语）

21. It’s the second time that I _______ in Beijing. What great changes! It’s years since I ________ here last time.

A．went; had left   B．had been; left    C．have been; left            D．have; had left

22. People from all over the world ________ China on the successful launch of Chang’E-1.

A．celebrated               B．greeted                   C．congratulated          D．enjoyed

23. He is really considering ______ himself to ______ these children of the poor mountain village.

A. to devote; educating                             B. devoting; educating

C. devoting; educate                                D. to devote; educate

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