问题
选择题
--- What do you think of the math problem ?
--- It’s very hard and nobody has _______.
A．put it out
B．helped it out
C．worked it out
D．solve
答案
答案：C
题目分析：句意：——这道数学题你认为怎么样？——我认为非常难，没有人能算出它。worked out算出，put out生产、伸出，help out帮助，solve解决（问题）
