Yang Liwei China’s first spaceman prepared carefully for going to space so that he could b

问题补充：

Yang Liwei，China’s first spaceman，prepared carefully for going to space so that he could be sure of success at his first .

A. experiment

B. flight

C. attempt

D. try

答案：

A. experiment

B. flight

(答案→)C. attempt

D. try

解析：at the first attempt意为“第一次尝试”。