问题
选择题
Tom succeeded, for he had made a great ______ and got over plenty of difficulties.
A．progress
B．force
C．energy
D．effort
答案
答案：D
考查名词辨析：A. progress进步B. force力量C. energy精力D. effort努力，句意是;汤姆成功了，因为他做出了努力并克服了很多困难。选D。