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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