一、单项填空（共15小题,每小题1分,满分15分） 从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。 1. Jiangsu Development Summit was open _____ May 20th in Nanjing. A. on B. in C. at D. by 2. — I can’t believe Jim got first in the competition. — As you know, God helps those who help ______. A. yourself B. himself C. yourselves D. themselves 3. _____ in the world is difficult for one who sets his mind to it.
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